style.css

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  position: relative;
}

/* Layout*/
#game-div, #game-div-overlay, #button, #info {
  position: absolute;
  left: 50%;
  top: 50%;
}

#game-div, #game-div-overlay {
  height: 480px;
  width: 640px;
  margin: -240px 0 0 -320px;
}

#button {
  height: 50px;
  width: 200px;
  margin: -300px 0 0 -100px;
}

#info {
  height: 50px;
  width: 640px;
  margin: 250px 0 0 -320px;
}

#game-div {
  z-index: 1;
}

#game-div-overlay {
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Styling */
#info {
  text-align: center;
}

#game-div {
  background-image: url("/images/bk..gif");
}

#game-div-overlay {
  color: white;
  background-color: rgba(0,0,0,0.8);
}

.hidden {
  display: none;
}


#clipboard {
  line-height: 20px;
}

#clipboard input {
  padding: 7px 8px;
  height: 34px;
  width: 350px;
}

#clipboard button {
  height: 34px;
  width: 34px;
  padding: 7px 8px;
}