.bapf_radio_chck ul li input[type=checkbox] {
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    appearance: none;
    display: inline-block;
    vertical-align: middle;
    border: 2px solid #555;
    width: 15px;
    height: 15px;
    outline: none;
    border-radius: 10px;
    padding: 2px;
    margin-right: 5px;
    position: relative;
}
.bapf_radio_chck ul li input[type="checkbox"]:checked:after {
    content: "";
    width: 8px;
    height: 12px;
    border-bottom: 2px solid #333;
    border-right: 2px solid #333;
    display: block;
    position: absolute;
    top: -4px;
    left: 3px;
    transform: rotate(45deg);
}