.first-header:before {
	content: "";
	display: inline-block;
	width: 20px;
	height: 20px;
	margin-right: 4px;
	background: url("../img/1.png") no-repeat;
}
.second-header:before {
	content: "";
	display: inline-block;
	width: 20px;
	height: 20px;
	margin-right: 4px;
	background: url("../img/2.png") no-repeat;
}
.third-header:before {
	content: "";
	display: inline-block;
	width: 20px;
	height: 20px;
	margin-right: 4px;
	background: url("../img/3.png") no-repeat;
}
.fourth-header:before {
	content: "";
	display: inline-block;
	width: 20px;
	height: 20px;
	margin-right: 4px;
	background: url("../img/4.png") no-repeat;
}