header{position: fixed;}
.caption {
	display:-webkit-box;
	display:-webkit-flex;
	display:-ms-flexbox;
	display:flex;
	position: fixed;
	width:100%;
	background-color: #fff;
	z-index:7;
	color: #4d4d4d;
	margin-top: 1.8rem;
}
.caption div {
	-webkit-box-flex:1;
	-webkit-flex:1;
	-ms-flex:1;
	flex:1;
	position: relative;
}
.caption span {
	position: relative;
	display: inline-block;
	width:100%;
	height:2rem;
	line-height: 2rem;
	font-size: 16px;
	text-align: center;
}
.caption span:before {
	content:"";
	position: absolute;
	left:50%;
	width:0;
	height:0;
	border-width:4px;
	border-style: solid;
	border-color: #4d4d4d transparent transparent transparent;
	top:46%;
	left:65%;
}
.caption span:nth-of-type(1):before {
	left:60%;
}
.caption ul {
	display: none;
	position: fixed;
	left: 0;
	width:100%;
	z-index:100;
	/*margin-top: -0.5rem;*/
	border-bottom: 0.05rem solid #f0f0f0;
    /*box-shadow: 0px 2px 3px #ddd;*/
}
.caption li {
	text-align: center;
	font-size: 16px;
	background-color: #fff;
	z-index:100;
	line-height: 1.5rem;
}
.brand_content {
	padding-top: 4rem;
}
.brand_content li {
	float:left;
	position: relative;
	width:50%;
	margin-top: 10px;
	height:14rem;
	overflow: hidden;
	box-sizing:border-box;
	-moz-box-sizing:border-box; /* Firefox */
	-webkit-box-sizing:border-box; /* Safari */
}
.brand_content li:nth-child(odd){
	padding-right: 5px;
}
.brand_content li:nth-child(even){
	padding-left: 5px;
}
.brand_content li img {
	width:100%;
}
.brand_content a {
	position: relative;
	display: inline-block;
	width:100%;
	height:100%;
}
.mask {
	width:100%;
	height:4.4rem;
	position: absolute;
	bottom:0;
	background-color: rgba(0,0,0,0.3);
}

@media only screen and (min-width: 320px) {
	 .brand_content li {
	 	height:210.8px !important;
	 }
	 .mask {
	 	height:54px !important;
	 }
	 .mask img {
	 	width:88.3px !important;
	 	height:44.15px !important;
	 	margin-left: -44.15px !important;
	 	bottom: 35px;
	 }
}


@media only screen and (min-width: 360px) {
	 .brand_content li {
	 	height:238px !important;
	 }
	 .mask {
	 	height:60.7px !important;
	 }
	 .mask img {
	 	width:99.75px !important;
	 	height:49.875px !important;
	 	margin-left: -49.875px !important;
	 	bottom: 35px;
	 }
}
@media only screen and (min-width: 412px) {
	 .brand_content li {
	 	height:273.36px !important;
	 }
	 .mask {
	 	height:70.25px !important;
	 }
	 .mask img {
	 	width:114.57px !important;
	 	height:57.3px !important;
	 	margin-left: -57.3px !important;
	 	bottom: 35px;
	 }
}

@media only screen and (min-width: 375px) {
	 .brand_content li {
	 	height:248px !important;
	 }
	 .mask {
	 	height:63px !important;
	 }
	 .mask img {
	 	width:104px !important;
	 	height:52px !important;
	 	margin-left: -52px !important;
	 	bottom: 40px;
	 }
}
@media only screen and (min-width: 414px) {
	 .brand_content li {
	 	height:274.7px !important;
	 }
	 .mask {
	 	height:70.6px !important;
	 }
	 .mask img {
	 	width:115px !important;
	 	height:57.5px !important;
	 	margin-left: -57.5px !important;
	 	bottom: 40px;
	 }
}
@media only screen and (min-width: 640px) {
	 .brand_content li {
	 	height:428.4px !important;
	 }
	 .mask {
	 	height:110px !important;
	 }
	 .mask img {
	 	width:180px !important;
	 	height:90px !important;
	 	margin-left: -90px !important;
	 	bottom: 58px;
	 }
}

.mask img {
	/*width:7.2rem !important;
	height:3.6rem;*/
	position:absolute;
	left:50%;
	margin-left: -3.6rem;
}
.mask p {
	width:100%;
	position: absolute;
	text-align: center;
	bottom:0.6rem;
	font-size: 16px;
	color:#fff;
}