input[type=checkbox] {
  -webkit-appearance:none;
  width:13px;
  height:13px;
  border:1px solid #DCDCDC;
  margin:3px 5px -2px 0;
  -webkit-border-radius:1px;
  -moz-border-radius:1px;
  border-radius:1px;
  -webkit-box-sizing:border-box;
  -moz-box-sizing:border-box;
  box-sizing:border-box;
  cursor:pointer;
  position:relative;
}
input[type=checkbox]:active {
  border-color:#C6C6C6;
  background:#ebebeb;
}
input[type=checkbox]:hover {
  border-color:#C6C6C6;
  -webkit-box-shadow:inset 0px 1px 1px rgba(0,0,0,0.1);
  -moz-box-shadow:inset 0px 1px 1px rgba(0,0,0,0.1);
  box-shadow:inset 0px 1px 1px rgba(0,0,0,0.1);
}
input[type=checkbox]:checked::after {
  content:url('check_no_box.png');
  display:block;
  position:absolute;
  top:-6px;
  left:-5px;
}