styles.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-image: linear-gradient(180deg, white, lightblue, blue);
    height: 100vh;
}

.mainDiv, .container {
    width: 100%;
    text-align: center;
}

.mainDiv {
    padding-top: 4%;
}

.addBtn {
    font-size: 16px;
    height: 25px;
    width: 25px;
    font-weight: bold;
    background-color: black;
    color: white;
    border: none;
    border-radius: 10px;
    outline: none;
    cursor: pointer;
}

.inputField {
    border: none;
    background-color: white;
    color: black;
    font-size: 16px;
    height: 25px;
    width: 40%;
    border-radius: 16px;
    padding-left: 10px;
    margin-right: 10px;
    outline: none;
}

.editBtn  {
    cursor: pointer;
    color: greenyellow;
    background-color: transparent;
    font-size: 16px;
    border: none;
    outline: none;
    margin-right: 10px;
}

.deleteBtn  {
    cursor: pointer;
    color: red;
    background-color: transparent;
    font-size: 16px;
    border: none;
    outline: none;
}

.item {
    height: 25px;
    border: none;
    border-radius: 16px;
    margin-right: 10px;
    background-color: white;
    width: 25%;
    color: black;
    padding-left: 10px;
    outline: none;
    font-size: 15px;
}

.main {
    padding-top: 4%;
}