@media screen and (max-width: 1200px) {
 
 /* 640px */ 
   .bg_03 { width:100%;  height: auto;  background-image: url(../images/bg77.jpg); background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;} 
  
  .zs_box{ width:96%; padding-bottom:63%; margin:0 auto; }
  
  #zs_box{ display:none; }

}


 
  @media screen and (min-width: 1200px) {
 
 /* 1360px */ 
 
  .bg_03 { width:100%;  height: auto;  background-image: url(../images/bg77.jpg); background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;} 
  
  .zs_box{ width:96%; height:780px; margin:0 auto; }
  
   #m_zs_box{ display:none; }


}
 
 
 
 @media screen and (min-width: 1400px) {
 
 /* 1440px */ 
  
  .bg_03 { width:100%;  height: auto;  background-image: url(../images/bg77.jpg); background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;} 
  
  .zs_box{ width:96%; height:820px; margin:0 auto; }

   #m_zs_box{ display:none; }

}





 @media screen and (min-width: 1500px) {
 
 /* 1600px */ 
   .bg_03 { width:100%;  height: auto;  background-image: url(../images/bg77.jpg); background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;} 
  
  .zs_box{ width:96%; height:920px; margin:0 auto; }
  
  #m_zs_box{ display:none; }

}



 @media screen and (min-width: 1740px) {
 
  /* 1920px */ 
  
  .bg_03 { width:100%;  height: auto;  background-image: url(../images/bg77.jpg); background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;} 
  
  .zs_box{ width:96%; height:1100px; margin:0 auto; }
  
  #m_zs_box{ display:none; }
  

}