header, #center, .center {
    text-align: center;
}
#right {
    position: fixed;
    right: 5%;
}
#left {
    position: fixed;
    left: 5%;
}
section, article, div {
    width: 50%;
    margin-left: 25%;
}
#bottom {
    position: absolute;
    bottom: 5%;
}
.slider .versions li {
    display: inline-block;
    width: 18%;
  }
  .slider input[type="range"] {
    width: 90%;
  }
  .slider {
    width: 95%;
    margin: 20px 0;
    padding: 20px;
    position: relative;
  }
  #small {
    transform: scale(1.2);
  }
  #validation {
    text-align: center;
}