#main1 {
            background-color: #D90000;
            background-image: url( @Url.Content("~/content/images/login/loginpa.gif") );
            width: 100%;
            height: 345px;
            background-repeat: no-repeat;
          
            align-items: center;
            padding: 30px;
            box-sizing: border-box;
        }

    .xsChild{
	      display: none;
margin-top:40%
}

        @media screen and (max-width: 767px) {
            /* 移动设备样式 */
            body {
                background-image: url( @Url.Content("~/content/images/login/bg.jpg") );
            }
	    .xsMain {
	        display: none;
	    }
  .xsChild {
	        display: block;
	  display: flex;
            flex-direction: column;
	    }
        }

        @media screen and (min-width: 768px) {
            /* 桌面设备样式 */
            body {
                background-image: url( ../content/images/login/bg.jpg );
           }
           .xsChild {
	        display: none;
	    }
  .xsMain {
	        display: block;
	    }
        }