diff --git a/app.js b/app.js
index ab737a6002..c6ee8472df 100644
--- a/app.js
+++ b/app.js
@@ -8,139 +8,143 @@
 
 // Event handling, user interaction is what starts the code execution.
 
-var taskInput=document.getElementById("new-task");//Add a new task.
+var taskInput=document.querySelector(".add-section__input");//Add a new task.
 var addButton=document.getElementsByTagName("button")[0];//first button
-var incompleteTaskHolder=document.getElementById("incompleteTasks");//ul of #incompleteTasks
-var completedTasksHolder=document.getElementById("completed-tasks");//completed-tasks
+var incompleteTaskHolder=document.querySelector(".todo-section__content");//ul of .todo-section__content
+var completedTasksHolder=document.querySelector(".complete-section__content");//completed-tasks
 
 
 //New task list item
 var createNewTaskElement=function(taskString){
 
-    var listItem=document.createElement("li");
-
-    //input (checkbox)
-    var checkBox=document.createElement("input");//checkbx
-    //label
-    var label=document.createElement("label");//label
-    //input (text)
-    var editInput=document.createElement("input");//text
-    //button.edit
-    var editButton=document.createElement("button");//edit button
-
-    //button.delete
-    var deleteButton=document.createElement("button");//delete button
-    var deleteButtonImg=document.createElement("img");//delete button image
-
-    label.innerText=taskString;
-    label.className='task';
-
-    //Each elements, needs appending
-    checkBox.type="checkbox";
-    editInput.type="text";
-    editInput.className="task";
-
-    editButton.innerText="Edit"; //innerText encodes special characters, HTML does not.
-    editButton.className="edit";
-
-    deleteButton.className="delete";
-    deleteButtonImg.src='./remove.svg';
-    deleteButton.appendChild(deleteButtonImg);
-
-
-    //and appending.
-    listItem.appendChild(checkBox);
-    listItem.appendChild(label);
-    listItem.appendChild(editInput);
-    listItem.appendChild(editButton);
-    listItem.appendChild(deleteButton);
-    return listItem;
+  var listItem=document.createElement("li");
+  listItem.classList.add("list");
+  //input (checkbox)
+  var checkBox=document.createElement("input");//checkbx
+  //label
+  var label=document.createElement("label");//label
+  //input (text)
+  var editInput=document.createElement("input");//text
+  //button.edit
+  var editButton=document.createElement("button");//edit button
+
+  //button.delete
+  var deleteButton=document.createElement("button");//delete button
+  var deleteButtonImg=document.createElement("img");//delete button image
+  deleteButtonImg.className='delete-btn__img';
+
+  label.innerText=taskString;
+  label.className='task-label';
+
+  //Each elements, needs appending
+  checkBox.type="checkbox";
+  checkBox.className="checkbox";
+  editInput.type="text";
+  editInput.className="task-input";
+
+  editButton.innerText="Edit"; //innerText encodes special characters, HTML does not.
+  editButton.className="edit-btn task-button";
+
+  deleteButton.className="delete-btn task-button";
+  deleteButtonImg.src='./remove.svg';
+  deleteButton.appendChild(deleteButtonImg);
+
+
+  //and appending.
+  listItem.appendChild(checkBox);
+  listItem.appendChild(label);
+  listItem.appendChild(editInput);
+  listItem.appendChild(editButton);
+  listItem.appendChild(deleteButton);
+  return listItem;
 }
 
 
 
 var addTask=function(){
-    console.log("Add Task...");
-    //Create a new list item with the text from the #new-task:
-    if (!taskInput.value) return;
-    var listItem=createNewTaskElement(taskInput.value);
+  console.log("Add Task...");
+  //Create a new list item with the text from the .add-section__input:
+  if (!taskInput.value) return;
+  var listItem=createNewTaskElement(taskInput.value);
 
-    //Append listItem to incompleteTaskHolder
-    incompleteTaskHolder.appendChild(listItem);
-    bindTaskEvents(listItem, taskCompleted);
+  //Append listItem to incompleteTaskHolder
+  incompleteTaskHolder.appendChild(listItem);
+  bindTaskEvents(listItem, taskCompleted);
 
-    taskInput.value="";
+  taskInput.value="";
 
 }
 
 //Edit an existing task.
 
 var editTask=function(){
-    console.log("Edit Task...");
-    console.log("Change 'edit' to 'save'");
-
-
-    var listItem=this.parentNode;
-
-    var editInput=listItem.querySelector('input[type=text]');
-    var label=listItem.querySelector("label");
-    var editBtn=listItem.querySelector(".edit");
-    var containsClass=listItem.classList.contains("editMode");
-    //If class of the parent is .editmode
-    if(containsClass){
-
-        //switch to .editmode
-        //label becomes the inputs value.
-        label.innerText=editInput.value;
-        editBtn.innerText="Edit";
-    }else{
-        editInput.value=label.innerText;
-        editBtn.innerText="Save";
-    }
-
-    //toggle .editmode on the parent.
-    listItem.classList.toggle("editMode");
+  console.log("Edit Task...");
+  console.log("Change 'edit' to 'save'");
+
+
+  var listItem=this.parentNode;
+
+  var editInput=listItem.querySelector('.task-input');
+  var label=listItem.querySelector("label");
+  var editBtn=listItem.querySelector(".edit-btn");
+  var containsClass=listItem.classList.contains("todo-section__edit");
+  //If class of the parent is .todo-section__edit
+  if(containsClass){
+
+    //switch to .todo-section__edit
+    //label becomes the inputs value.
+    label.innerText=editInput.value;
+    editBtn.innerText="Edit";
+  }else{
+    editInput.value=label.innerText;
+    editBtn.innerText="Save";
+  }
+
+  //toggle .todo-section__edit on the parent.
+  listItem.classList.toggle("todo-section__edit");
 };
 
 
 //Delete task.
 var deleteTask=function(){
-    console.log("Delete Task...");
+  console.log("Delete Task...");
 
-    var listItem=this.parentNode;
-    var ul=listItem.parentNode;
-    //Remove the parent list item from the ul.
-    ul.removeChild(listItem);
+  var listItem=this.parentNode;
+  var ul=listItem.parentNode;
+  //Remove the parent list item from the ul.
+  ul.removeChild(listItem);
 
 }
 
 
 //Mark task completed
 var taskCompleted=function(){
-    console.log("Complete Task...");
+  console.log("Complete Task...");
 
-    //Append the task list item to the #completed-tasks
-    var listItem=this.parentNode;
-    completedTasksHolder.appendChild(listItem);
-    bindTaskEvents(listItem, taskIncomplete);
+  //Append the task list item to the .complete-section__content
+  var listItem=this.parentNode;
+  completedTasksHolder.appendChild(listItem);
+  listItem.classList.add('complete-section__list');
+  bindTaskEvents(listItem, taskIncomplete);
 
 }
 
 
 var taskIncomplete=function(){
-    console.log("Incomplete Task...");
-//Mark task as incomplete.
-    //When the checkbox is unchecked
-    //Append the task list item to the #incompleteTasks.
-    var listItem=this.parentNode;
-    incompleteTaskHolder.appendChild(listItem);
-    bindTaskEvents(listItem,taskCompleted);
+  console.log("Incomplete Task...");
+  //Mark task as incomplete.
+  //When the checkbox is unchecked
+  //Append the task list item to the .todo-section__content.
+  var listItem=this.parentNode;
+  listItem.classList.remove('complete-section__list');
+  incompleteTaskHolder.appendChild(listItem);
+  bindTaskEvents(listItem,taskCompleted);
 }
 
 
 
 var ajaxRequest=function(){
-    console.log("AJAX Request");
+  console.log("AJAX Request");
 }
 
 //The glue to hold it all together.
@@ -153,27 +157,27 @@ addButton.addEventListener("click",ajaxRequest);
 
 
 var bindTaskEvents=function(taskListItem,checkBoxEventHandler){
-    console.log("bind list item events");
-//select ListItems children
-    var checkBox=taskListItem.querySelector("input[type=checkbox]");
-    var editButton=taskListItem.querySelector("button.edit");
-    var deleteButton=taskListItem.querySelector("button.delete");
-
-
-    //Bind editTask to edit button.
-    editButton.onclick=editTask;
-    //Bind deleteTask to delete button.
-    deleteButton.onclick=deleteTask;
-    //Bind taskCompleted to checkBoxEventHandler.
-    checkBox.onchange=checkBoxEventHandler;
+  console.log("bind list item events");
+  //select ListItems children
+  var checkBox=taskListItem.querySelector(".checkbox");
+  var editButton=taskListItem.querySelector("button.edit-btn");
+  var deleteButton=taskListItem.querySelector("button.delete-btn");
+
+
+  //Bind editTask to edit button.
+  editButton.onclick=editTask;
+  //Bind deleteTask to delete button.
+  deleteButton.onclick=deleteTask;
+  //Bind taskCompleted to checkBoxEventHandler.
+  checkBox.onchange=checkBoxEventHandler;
 }
 
 //cycle over incompleteTaskHolder ul list items
 //for each list item
 for (var i=0; i<incompleteTaskHolder.children.length;i++){
 
-    //bind events to list items chldren(tasksCompleted)
-    bindTaskEvents(incompleteTaskHolder.children[i],taskCompleted);
+  //bind events to list items chldren(tasksCompleted)
+  bindTaskEvents(incompleteTaskHolder.children[i],taskCompleted);
 }
 
 
@@ -181,8 +185,8 @@ for (var i=0; i<incompleteTaskHolder.children.length;i++){
 
 //cycle over completedTasksHolder ul list items
 for (var i=0; i<completedTasksHolder.children.length;i++){
-    //bind events to list items chldren(tasksIncompleted)
-    bindTaskEvents(completedTasksHolder.children[i],taskIncomplete);
+  //bind events to list items chldren(tasksIncompleted)
+  bindTaskEvents(completedTasksHolder.children[i],taskIncomplete);
 }
 
 
diff --git a/index.html b/index.html
index ef4aa1f60c..065a74e9f7 100644
--- a/index.html
+++ b/index.html
@@ -1,19 +1,83 @@
-<html>
-<HEAD><title>Todo App</title>
-<link href='https://fonts.googleapis.com/css?family=Lato:300,400,700' rel='stylesheet' type='text/css'>
-<link rel="stylesheet" href="style.css" type="text/css" MEDIA="screen" charset="utf-8">
-</HEAD>
-<body>
-<div class="aaa"><img src="./eisenhower-matrix.jpg"><a class='more_inf' href="https://goal-life.com/page/method/matrix-eisenhower">Want more details&quest;</a></div>
-<div class="centered-main-page-element"><p id='topSectionForAddingElementToList'><label for="new-task">Add Item</label><div class="task-row-wrapper"><input id='new-task'class="task" type="text"><button>Add</button></div>
-</p><h3>Todo</h3>
-<ul id='incompleteTasks'>
-<li><input type='checkbox'><label class="task">Pay Bills</label><input type="text" class="task"><button class="edit">Edit</button><button class="delete"><img src="./remove.svg"></button></li>
-<li class="editMode"><input type="checkbox"><label class="task">Go Shopping</label><input type="text" value="Go Shopping" class="task"><button class='edit'>Save</button><button class="delete"><img src="./remove.svg"></button></li>
-</ul><h3>Completed</h3><ul id="completed-tasks"><li><input type="checkbox" checked><label class="task">See the Doctor</label><input type="text" class="task"><button class="edit">Edit</button><button class="delete"><img src="./remove.svg"></button>
-</li>
-</ul>
-</div>
-<script type="text/javascript" SRC="app.js"></script>
-</body>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Todo App</title>
+    <link href="https://fonts.googleapis.com/css?family=Lato:300,400,700" 
+      rel="stylesheet">
+    <link rel="stylesheet" href="style.css"  media="screen">
+  </head>
+  <body class="body">
+    <header class="header">
+      <img 
+        class="header__img" 
+        src="./eisenhower-matrix.jpg" 
+        alt="Matrix-picture"
+      >
+      <a class="header__link"
+         href="https://goal-life.com/page/method/matrix-eisenhower">
+        Want more details?
+      </a>
+    </header>
+    <main class="main">
+      <section class="add-section">
+        <h3 class="add-section__header">Add Item</h3>
+        <div class="add-section__content">
+          <input 
+            class="add-section__input task-input" 
+            type="text"
+          >
+          <button class="add-section__button task-button">Add</button>
+        </div>
+      </section>
+      <section class="todo-section">
+          <h3 class="todo-section__header">Todo</h3>
+          <ul class="todo-section__content">
+            <li class="todo-section__task list">
+              <input 
+                class="todo-section__task-chekbox checkbox" 
+                type="checkbox" 
+              >
+              <label class="task-label">Pay Bills</label>
+              <input class="task-input" type="text">
+              <button class="edit-btn task-button">Edit</button>
+              <button class="delete-btn task-button">
+                <img class="delete-btn__img" src="./remove.svg" alt="delete">
+              </button>
+            </li>
+            <li class="todo-section__edit list">
+              <input 
+                class="todo-section__edit-chekbox checkbox" 
+                type="checkbox"
+              >
+              <label class="task-label">Go Shopping</label>
+              <input class="task-input" type="text" value="Go Shopping"> 
+              <button class="edit-btn task-button">Save</button>
+              <button class="delete-btn task-button">
+                <img class="delete-btn__img" src="./remove.svg" alt="delete">
+            </button>
+              </li>
+            </ul>
+      </section>
+      <section class="complete-section">
+        <h3 class="complete-section__header">Completed</h3>
+        <ul class="complete-section__content">
+          <li class="complete-section__list list">
+            <input 
+              class="complete-section__list-checkbox checkbox"
+              type="checkbox" checked
+            >
+            <label class="task-label">See the Doctor</label>
+            <input  class="task-input" type="text">
+            <button class="edit-btn task-button">Edit</button>
+            <button class="delete-btn task-button">
+                <img class="delete-btn__img" src="./remove.svg" alt="delete">
+            </button>
+        </li>
+        </ul>
+      </section>
+    </main>
+    <script src="app.js"></script>
+  </body>
 </html>
\ No newline at end of file
diff --git a/style.css b/style.css
index ab36227705..7e76eeed3d 100644
--- a/style.css
+++ b/style.css
@@ -1,148 +1,145 @@
 /* Basic Style */
-body {
-    background-color: #f8f8f8;
-    color: #333;
-    font-family: Lato, sans-serif;
+.body {
+  background-color: #f8f8f8;
+  color: #333;
+  font-family: Lato, sans-serif;
 }
-.aaa {
-    width: 500px;
-    margin: 0 auto;
-    display: block;
-    text-align: right;
+.header {
+  width: 500px;
+  margin: 0 auto;
+  display: block;
+  text-align: right;
 }
-.aaa img {
-    width: 100%;
+.header__img {
+  width: 100%;
 }
-.aaa .more_inf {
-    font-family: fantasy, cursive;
+.aaa .header__link {
+  font-family: fantasy, cursive;
 }
 
-@media (max-width:768px) {
-.aaa { text-align: center;
-}
-}
-.centered-main-page-element {
-    display: block;
-    width: 500px;
-    margin: 0 auto 0;
-}
-.task {
-    width: 56%;
-    display: inline-block;
-    flex-grow: 1
-}
-.task-row-wrapper {
-    display: flex;
-}
-ul {
-    margin:0;
-    padding: 0px;
-}
-li, h3 {
-    list-style:none;
-}
-input,button{
-    outline:none;
-}
-button {
-    background: none;
-    border: 0px;
-    color: #888;
-    font-size: 15px;
-    width: 60px;
-    font-family: Lato, sans-serif;
-    cursor: pointer;
-}
-button:hover {
-    color: #3a3A3a;
+@media (max-width: 768px) {
+.header { 
+  text-align: center;
+}
+}
+.main {
+  display: block;
+  width: 500px;
+  margin: 0 auto 0;
+}
+.task-label,
+.task-input {
+  width: 56%;
+  display: inline-block;
+  flex-grow: 1;
+}
+.add-section__content {
+  display: flex;
+}
+.todo-section__content,
+.complete-section__content {
+  margin: 0;
+  padding: 0px;
+}
+.task-input,
+.todo-section__task-chekbox,
+.todo-section__edit-chekbox,
+.complete-section__list-checkbox {
+  outline: none;
+}
+.task-button {
+  background: none;
+  border: 0px;
+  color: #888;
+  font-size: 15px;
+  width: 60px;
+  font-family: Lato, sans-serif;
+  cursor: pointer;
+  outline: none;
+}
+.task-button:hover {
+  color: #3a3A3a;
 }
 /* Heading */
-h3,
-label[for='new-task'] {
-    color: #333;
-    font-weight: 700;
-    font-size: 15px;
-    border-bottom: 2px solid #333;
-    padding: 30px 0 10px;
-    margin: 0;
-    text-transform: uppercase;
-}
-input[type="text"] {
-    margin: 0;
-    font-size: 18px;
-    line-height: 18px;
-    height: 21px;
-    padding: 0 9px;
-    border: 1px solid #dDd;
-    background: #FFF;
-    border-radius: 6px;
-    font-family: Lato, sans-serif;
-    color: #888;
-}
-input[type="text"]:focus {
-    color: #333;
+.todo-section__header,
+.complete-section__header {
+  color: #333;
+  font-weight: 700;
+  font-size: 15px;
+  border-bottom: 2px solid #333;
+  padding: 30px 0 10px;
+  margin: 0;
+  text-transform: uppercase;
+}
+.add-section__header {
+  margin: 0;
+  font-size: 18px;
+  line-height: 18px;
+  height: 19px;
+  padding: 0 9px;
+  border: 1px solid #dDd;
+  background: #FFF;
+  border-radius: 6px;
+  font-family: Lato, sans-serif;
+  color: #888;
+  width: 226px;
+}
+.task-input:focus {
+  color: #333;
 }
 
 /* New Task */
-label[for='new-task'] {
-    display: block;
-    margin: 0 0 20px;
-}
-input#new-task {
-    width: 318px;
+.add-section__input {
+  width: 318px;
 }
 
 /* Task list */
-li {
-    overflow: hidden;
-    padding: 20px 0;
-    border-bottom: 1px solid #eee;
-
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-}
-li > * {
-    vertical-align: middle;
+.list {
+  overflow: hidden;
+  padding: 20px 0;
+  border-bottom: 1px solid #eee;
+  list-style: none;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  vertical-align: middle;
 }
 
-li > input[type="checkbox"] {
-    margin: 0 10px;
-}
-li > label {
-    padding-left: 10px;
-    box-sizing: border-box;
-    font-size: 18px;
-    width: 226px;
+.checkbox {
+  margin: 0 10px;
 }
-li >    input[type="text"] {
-    width: 226px
+.task-label {
+  padding-left: 10px;
+  box-sizing: border-box;
+  font-size: 18px;
+  width: 226px;
 }
-button.delete img {
-    height: 2em;
-    transform: rotateZ(45deg);
-    transition: transform 200ms ease-in;
+
+.delete-btn__img {
+  height: 2em;
+  transform: rotateZ(45deg);
+  transition: transform 200ms ease-in;
 }
-button.delete img:hover {
-    transform: rotateZ(0);
+.delete-btn__img:hover {
+  transform: rotateZ(0);
 }
 
 /* Completed */
-ul#completed-tasks label {
-    text-decoration: line-through
-    color: #888;
+.completed-section__list .task-label {
+  text-decoration: line-through;
+  color: #888;
 }
 
 /* Edit Task */
-ul li input[type=text] {
-    display:none
+.list .task-input {
+  display: none;
 }
 
-ul li.editMode input[type=text] {
-    display:inline-block;
-    width:224px
+.todo-section__edit .task-input {
+  display: inline-block;
+  width: 224px;
 }
 
-ul li.editMode label {
-    display:none;
+.todo-section__edit .task-label {
+  display: none;
 }
\ No newline at end of file