nav:not(.mm-menu)
{
	display: none;
}

.header a.menu
{
	background: center center no-repeat transparent;
	background-image: url(../images/set.png);

	display: block;
	width: .46rem;
	height: .38rem;
	position: absolute;
	top: .3rem;
	background-size:100%

}
.header a.menu_l{ left:.25rem;}
.header a.menu_r{ right:.25rem;}

/*颜色定义*/

/*头部*/

/*侧边背景*/
.mm-menu{ 
	background: #f3f3f3;
}