html,body  {
    border:0;
    margin:0 auto; 
    padding:0; 
    font-size:14px; 
    font-family:Microsoft YaHei;
    
}
h1, h2, h3, h4, h5, h6 ,P {margin:0;padding:0;font-weight:normal; }
ul,li{ margin:0; padding:0; list-style-type:none;}
img{ border: 0; margin: 0; padding: 0; }
.clear{ clear:both; }
.left{ float:left; display:inline;  }
.right{ float:right; }
.center{ text-align: center; }
.miit_foot{ position: fixed; text-align: center; font-weight: bolder; width: 100%; bottom: 3%; left: 0;  color: #ffffff; text-decoration: none; }

@media only screen and (max-width: 749px) {
    .vi_body{ position: fixed; left: 0;top: 0;right: 0;bottom: 0; width: 100%; height: 100%; background:url('../img/bg.jpg') no-repeat top #CCCCCC; background-size:520%; }
    .vi_banner{  display: none;width: 92%; height: 210px; margin: 0 auto; padding-top: 60px; text-align: center;  }
    .vi_banner2{ width: 92%; height: 210px; margin: 0 auto; padding-top: 60px; text-align: center;  }
}

/* big */
@media only screen and (min-width: 750px) {
    .vi_body{ position: fixed; left: 0;top: 0;right: 0;bottom: 0; width: 100%; height: 100%; background:url('../img/bg.jpg') no-repeat top #CCCCCC; background-size:150%; }
    .vi_banner{ width: 600px; height: 210px; margin: 0 auto; padding-top: 100px;  }
    .vi_banner2{ display: none; width: 600px; height: 210px; margin: 0 auto; padding-top: 100px;  }
}