复选框

input[type="checkbox"] {
   20px;
  height: 20px;
  display: inline-block;
  text-align: center;
  vertical-align: middle;
  line-height: 18px;
  position: relative;
}
input[type="checkbox"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  background: white;
   100%;
  height: 100%;
  border: 1px solid #d9d9d9;
}
input[type="checkbox"]:checked::before {
  content: "2713";
  background-color: #5FB878;
  position: absolute;
  top: 0;
  left: 0;
   100%;
  color: white;
  font-size: 20px;
  font-weight: bold;
}