HTML自定義Checkbox框背景色

input[type=checkbox]
{
margin-right:5px;
width:13px;
height:13px;
}
input[type=checkbox]:after
{
width: 100%;
height: 100%;
top: 0;
content: " ";
background-color:White;
color: #000000;
display: inline-block;
visibility: visible;
border-radius: 2px;
border:1px solid #A9A9A9;
}
input[type=checkbox][disabled=disabled]:after
{
width: 100%;
height: 100%;
top: 0;
content: " ";
background-color:#DCDCDC;
color: #000000;
display: inline-block;
visibility: visible;
border-radius: 2px;
border:1px solid #A9A9A9;
}
input[type=checkbox]:checked:after {
content: "\2713";/*UNICODE中對號*/
font-size: 12px;
font-weight:bold;
}