.com_tit{
	font-size: 32px;
	color: #222;
	font-weight: 550;
	text-align: center;
	padding-bottom: 50px;
}
.com_aa{
	padding-top: 50px;
	padding-bottom: 70px;
}
.a1_img{
	display: flex;
	justify-content: center;
}
.com_bb{
	background: #f4f4f4;
}