header{
 background:#fff;
 z-index: 1002;
 top:0;
 box-shadow: 0 2px 10px #aaa;
}
header a {
 color: #001C3D;
}
header .light{
 display:none;
}
header .dark{
 display:inline-block;
}
@media screen and (min-width:1024px){
   header .contact a {
      color: #2473C2;
      border: 1px solid #2473C2;
   }
}