#mask_select {
	position: relative;
	display: inline-table;
}
#mask_select:after {
	content: '\25BC';
	display: table;
	font-size: 10px;
	position: absolute;
	top: 5px;
	right: 5px;
}
#mask_select .mask_after {
	display: block;
	position: absolute;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
	z-index: 3;
}
.in_the_back {
	position: absolute;
	z-index: -2;
}