checkbox custom style

//check box html markup
<div class="ic-check-single-item">
  <label for="">
    <input type="checkbox">
     <i class="input-helper"></i>
         <span>Sale</span>
  </label>
</div>



//checkbox css
.ic-check-single-item {
    position: relative;
    margin-bottom: 20px;
}
.ic-check-single-item label {
    padding-left: 40px;
    display: block;
}
.ic-check-single-item input[type="checkbox"] {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  cursor: pointer;
  opacity: 0;
}
.ic-check-single-item input[type="checkbox"]:checked + .input-helper:before {
  border-color: #31334a;
}
.ic-check-single-item .input-helper:before,
.ic-check-single-item .input-helper:after {
  position: absolute;
  content: "";
  transition: all 200ms;
}
.ic-check-single-item .input-helper:before {
  left: 0;
  border: 1px solid #c7c8d1;
}
.ic-check-single-item input[type="checkbox"] {
  width: 25px;
  height: 25px;
  margin: 0px;
}
.ic-check-single-item input[type="checkbox"]:checked + .input-helper:before {
  background-color: #31334a;
}
.ic-check-single-item input[type="checkbox"]:checked + .input-helper:after {
  transform: scale(1);
  opacity: 1;
}
.ic-check-single-item .input-helper:before {
  top: 0;
  width: 25px;
  height: 25px;
  border-radius: 2px;
  color: #fff;
}
.ic-check-single-item .input-helper:after {
  content: '\2713';
  font-size: 13px;
  left: 6px;
  top: 3px;
  color: #fff;
  transform: scale(0);
  opacity: 0;
}
.ic-check-single-item span {
    font-size: 20px;
    color: #31334a;
    line-height: 1.3;
}