.top{
  width: 100%;
  height:100px ;
  text-align:center;
}


.manuA{
  height: 100px;
 width: 100%;
 transition:opacity 0.5s;
}

.manuA:hover{
  opacity: 0.7;
}

#imgA{
  position: absolute;
  width: 150px;
  z-index: 1;
  padding-left: 10px;
}

#imgB{
  opacity: 0.7;
  z-index: 0.1;
}


#imgC{
  position: absolute;
  width: 150px;
  z-index: 1;
  padding-left: 10px;
}

#imgD{
  opacity: 0.7;
  z-index: 0.1;
}



/* --------------------------------------------------------------*/



/* 768px以上 */
@media screen and (min-width: 768px) 

{

  .top{
    width: 2000px;
    height:400px ;
    text-align:center;
  }
  
  
  .manuA{
    height: 300px;
   width: 1200px;
   transition:opacity 0.5s;
  }
  
  .manuA:hover{
    opacity: 0.7;
  }
  
  #imgA{
    position: absolute;
    width: 400px;
    z-index: 1;
    padding-left: 30px;
  }
  
  #imgB{
    opacity: 0.7;
    z-index: 0.1;
  }
  
  
  #imgC{
    position: absolute;
    width: 400px;
    z-index: 1;
    padding-left: 30px;
  }
  
  #imgD{
    opacity: 0.7;
    z-index: 0.1;
  }
  
}