.spec_b{
	width:100%;
	margin: 24px 0 6px;
}
.spec_b a{
	width:100%;
	text-align: center;
	display: inline-block;
}
.spec_b img{
	width: auto;
	max-width: 100%;
	display:inline-block;
}
.spec_b img.small_picture{
	display:none;
}
@media (max-width: 767px) {
	.spec_b{
		margin-top: 20px;
		margin-bottom: 0;
	}
}
@media (max-width: 575px) {
	.spec_b img.small_picture{
		display:inline-block;
	}
	.spec_b .big_picture{
		display:none;
	}
}