默认情况下,背景属性是平铺的,如果背景图片较大,而box小,那么就只能显示左上角那块背景.如果要让背景全部显示出来,
.color_checked {
float: right;
width: 16px;
height: 16px;
background: url(../images/color_check.png) center 0 no-repeat;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}