/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
body {
  background: #ecf0f1;
  color: #8e44ad;
}
.center-on-page {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%,-50%);
          transform: translate(-50%,-50%);
}
input[type="checkbox"],
input[type="radio"] {
  position: absolute;
  opacity: 0;
  z-index: -1;
}
label {
  position: relative;
  display: inline-block;
  margin-right: 10px;
  margin-bottom: 10px;
  padding-left: 30px;
  padding-right: 10px;
  line-height: 36px;
  cursor: pointer;
}
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;
}
/* Checked */
input[type="checkbox"]:checked + label,
input[type="radio"]:checked + label {
  padding-left: 10px;
  color: #fff;
}
input[type="checkbox"]:checked + label::before,
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;
}