body {font-family:'Lato',sans-serif;}

.overlay {height:100%; width:0; position:fixed; z-index:1; top:0; left:0; background-color:rgb(0,0,0); background-color:rgba(0,0,0, 0.9); overflow-x:hidden; transition:0.5s;}
.overlay .overlay-content {position:relative; top:25%; width:100%; text-align:center; margin-top:30px;}
.overlay a {padding:8px; text-decoration:none; font-size:36px; color:#818181; display:block; transition:0.3s;}
.overlay a:hover, .overlay a:focus {color:#f1f1f1;}
.overlay .closebtn {position:absolute; top:20px; right:45px; font-size:60px;}

@media screen and (max-height:450px) {
  .overlay a {font-size:20px}
  .overlay .closebtn {font-size:40px; top:15px; right:35px;}
}