html,body{
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}
.w{
    position: relative;
    width: 100%;
    height: 100%;
}
.h{
    position: absolute;
    width:274px;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    -o-transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
}
.h span{
    display: block;
    text-align: center;
    line-height: 24px;
    font-size: 15px;
    color: gray;
}
.h span strong{
    color:#555555;
}
.logo{
    display: block;
    width:274px;
    height: 218px;
    background: url("../images/logo.png") no-repeat;
    background-size: contain;
    background-position: center center;
}