.bapf_ckbox_square 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: 20px;
height: 20px;
outline: none;
padding: 4px;
margin-right: 5px;
}
.bapf_ckbox_square input[type="checkbox"]:checked {
background: #555;
background-clip: content-box;
}