View file template/designs/shcms/input.css

.checkbox {
	vertical-align: middle;
	width: 16px;
	height: 16px;
	background: url(checkbox.png) no-repeat;
	cursor: pointer;
	float:right;
}
.checkbox.checked {
	background-position: -16px 0;
}
.checkbox.disabled {
	background-position: 0 -16px;
}
.checkbox.checked.disabled {
	background-position: -16px -16px;
}
.checkbox.focused {
	background-position: 0 -32px;
}
.checkbox.checked.focused {
	background-position: -16px -32px;
}