.center-on-page {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%,-50%);
          transform: translate(-50%,-50%);
}
input[type="radio"] {
  position: absolute;
  opacity: 0;
  z-index: -1;
}
.label {
  position: relative;
  display: inline-block;
  margin-right: 10px;
  margin-bottom: 10px;
  padding-left: 10px;
  padding-right: 10px;
  line-height: 36px;
  cursor: pointer;
  border: 2px solid #6c757d;
  border-radius: 18px;
}
.label::before {
  content: " ";
  position: absolute;
  top: 6px;
  left: 0;
  display: block;
  width: 24px;
  height: 24px;
  border: 2px solid #8e44ad;
  border-radius: 4px;
  z-index: -1;
}
input[type="radio"] + .label::before {
  border-radius: 18px;
  border: 2px solid #fff;
}
/* Checked */
input[type="radio"]:checked + .label {
  padding-left: 10px;
  color: #fff;
  border: 2px solid #5cb85c;
  border-radius: 18px;
  background: #5cb85c;
}

input[type="radio"]:checked + .label::before {
  top: 0;
  width: 100%;
  height: 100%;
  background: #8e44ad;
}
/* Transition */
.label,
.label::before {
  -webkit-transition: .25s all ease;
  transition: .25s all ease;
}