*{margin: 0;padding: 0;box-sizing: border-box;}
body{
  max-width: 750px;
  min-width: 320px;
  margin: 0 auto;
}
.title{font-size: 28px;text-align: center;padding: 10px 0;}
.content{padding: 30px 16px 40px 16px;} 
.content .list{
  padding: 10px 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.content .list span{
  flex: 1;
  font-size: 18px;
  color: #333;
}
input[type="checkbox"] {
  display: none;
}
.chk + label {
  background-color: #fafbfa;
  padding: 9px;
  border-radius: 50px;
  display: inline-block;
  position: relative;
  margin-right: 30px;
  -webkit-transition: all 0.1s ease-in;
  transition: all 0.1s ease-in;
  width: 40px;
  height: 31px;
}
.chk + label:after {
content: ' ';
position: absolute;
top: 0;
-webkit-transition: box-shadow 0.1s ease-in;
transition: box-shadow 0.1s ease-in;
left: 0;
width: 100%;
height: 100%;
border-radius: 100px;
box-shadow: inset 0 0 0 0 #eee, 0 0 1px rgba(0,0,0,0.4);
width: 60px;
height: 31px;
}
.chk + label:before {
content: ' ';
position: absolute;
background: white;
top: 0;
left: 1px;
z-index: 999999;
width: 31px;
-webkit-transition: all 0.1s ease-in;
transition: all 0.1s ease-in;
height: 31px;
border-radius: 100px;
box-shadow: 0 3px 1px rgba(0,0,0,0.05), 0 0px 1px rgba(0,0,0,0.3);
}
.chk:active + label:after {
box-shadow: inset 0 0 0 20px #eee, 0 0 1px #eee;
}
.chk:active + label:before {
width: 37px;
}
.chk:checked:active + label:before {
width: 37px;
left: 20px;
}
.chk + label:active {
box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px 1px 3px rgba(0,0,0,0.1);
}
.chk:checked + label:before {
content: ' ';
position: absolute;
left: 29px;
border-radius: 100px;
}
.chk:checked + label:after {
width: 60px;
height: 31px;
content: ' ';
font-size: 28px;
position: absolute;
background: #4cda60;
box-shadow: 0 0 1px #4cda60;
}


.footer_tip{
  color: red;
  padding: 0 18px;
  font-size: 14px;
}