ストック / チェックボックをいい感じにするCSS

$checkbox_height: 22px;
$checkbox_margin: 25px;

$c_white: #fff;
$c_gray: #eee;
$c_navy: #002b53;

.nice-checkbox {
  /* hide checkbox */
  input[type=checkbox] {
    visibility: hidden;
  }

  float: left;
  margin: 0 7px 7px 0;
  position: relative;

  label {
    display: inline-block;
    height: $checkbox_height;
    background-color: $c_white;
    border: 1px solid $c_gray;
    border-radius: 2px;
    cursor: pointer;
    /* Checkbox text style */
    position: relative;
    margin-left: - $checkbox_margin;
    padding: 0 7px 0 22px;
    font-size: 12px;
    color: $c_navy;
    line-height: $checkbox_height;
  }
  /* Tick mark */
  label:after {
    content: "";
    opacity: 0.2;
    width: 9px;
    height: 5px;
    background: transparent;
    border: 3px solid $c_navy;
    border-top: none;
    border-right: none;

    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);

    position: absolute;
    top: $checkbox_height/5;
    left: 6px;
  }

  /* Hover state */
  label:hover:after {
    opacity: 0.5;
  }
  input[type=checkbox]:checked + label:after {
    opacity: 1;
    border-color: $c_white;
  }
  input[type=checkbox]:checked + label {
    background-color: $c_navy;
    color: $c_white;
    border-radius: 3px;
    font-weight: bold;
  }
}