SOURCE

	<input id="checked" type="checkbox" name="hu" checked="checked"/>

  #checked[type=checkbox] {
            position: relative;
            width: 16px;
            height: 16px;
            cursor: pointer;
        }
  #checked[type=checkbox]::after {
            position: absolute;
            top: 0;
            color: #000;
            width: 16px;
            height: 16px;
            display: inline-block;
            visibility: visible;
            padding-left: 0px;
            text-align: center;
            content: ' ';
            border-radius: 3px
        }
   #checked[type=checkbox]:checked::after {
            content: "✓";
            color: #fff;
            font-size: 12px;
            line-height: 16px;
            font-weight: bold;
            background-color: rgb(94, 58, 252);
        }