.mt100{margin-top: 100px;}
.mb50{margin-bottom: 50px;}
.pl40{padding-left: 40px;}
.aboutTitle{
	font-family: STHeitiSC-Light;
	font-size: 30px;
	color: #333333;
	letter-spacing: -0.72px;
	margin-top: 100px;
	padding-left: 40px;
}
.contactUs .content{
	font-size: 16px;
}
.m-demo{
    position:relative;
    width: 100%;
    overflow:hidden;
    min-height: 400px;
}
.m-demo p{
	width: 1240px;
    position:absolute;
    top:50%;
    left:50%;
    margin:0;
    padding:0;
}
.m-demo img{
    position:absolute;
    top:-50%;
    left:-50%;
    display:block;
    width: 1240px;
}
.m-demo img.hidden{visibility:hidden;position:static;}