css3動畫過渡按鈕

css(css代碼是網上找的)和html代碼：

.mui-switch {
      width: 52px;
      height: 31px;
      position: relative;
      border: 1px solid #dfdfdf;
      background-color: #fdfdfd;
      box-shadow: #dfdfdf 0 0 0 0 inset;
      border-radius: 20px;
      border-top-left-radius: 20px;
      border-top-right-radius: 20px;
      border-bottom-left-radius: 20px;
      border-bottom-right-radius: 20px;
      background-clip: content-box;
      display: inline-block;
      -webkit-appearance: none;
      user-select: none;
      outline: none; 
    }
  .mui-switch:before {
    content: '';
    width: 29px;
    height: 29px;
    position: absolute;
    top: 0px;
    left: 0;
    border-radius: 20px;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4); 
  }
  .mui-switch:checked {
    border-color: #64bd63;
    box-shadow: #64bd63 0 0 0 16px inset;
    background-color: #64bd63; 
  }
  .mui-switch:checked:before {
    left: 21px; 
  }
  .mui-switch.mui-switch-animbg {
    transition: background-color ease 0.4s; 
  }
  .mui-switch.mui-switch-animbg:before {
    transition: left 0.3s; 
  }
  .mui-switch.mui-switch-animbg:checked {
    box-shadow: #dfdfdf 0 0 0 0 inset;
    background-color: #64bd63;
    transition: border-color 0.4s, background-color ease 0.4s; 
  }
  .mui-switch.mui-switch-animbg:checked:before {
    transition: left 0.3s; 
  }
  .mui-switch.mui-switch-anim {
    transition: border cubic-bezier(0, 0, 0, 1) 0.4s, box-shadow cubic-bezier(0, 0, 0, 1) 0.4s; 
  }
  .mui-switch.mui-switch-anim:before {
    transition: left 0.3s; 
  }
  .mui-switch.mui-switch-anim:checked {
    box-shadow: #64bd63 0 0 0 16px inset;
    background-color: #64bd63;
    transition: border ease 0.4s, box-shadow ease 0.4s, background-color ease 1.2s; 
  }
  .mui-switch.mui-switch-anim:checked:before {
    transition: left 0.3s; 
  }
  .set_default{
    position: absolute;
    width: 52px;
    right: 17px;
    top: 8px;
  }
  .postmast{
    width: 100%;
    height: 50px;
    position: absolute;
    top: 0px;
    left: 0px;
    z-index: 2;
  }
             <div class="set_default">
                  <label><input class="mui-switch mui-switch-animbg" type="checkbox" ng-model="inpArr[0]" ng-change="touchSetCheck(0)" ng-checked="inpArr[0]"></label>
                </div>