.intro {display:flex; justify-content: center; align-items: center; width:100%; height:100vh; background: url(/images/common/intro.jpg) no-repeat center/cover;} 
.intro a {display: block;} 

@media (max-width: 1600px){
 .intro a img {height:200px;} 
}
 
@media (max-width: 1024px){
 .intro a img {height: 150px;} 
}

@media (max-width: 900px){
 .intro {background-position-x: 47%;} 
}

@media (max-width: 640px){
 .intro {background-position-x: 32%;} 
 .intro a img {height: 100px;} 
}