.overlay {
  height: 100%;
  width: 100%;
 display: none;
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  background-color: rgba(0,0,0, 0.9);
  overflow-y: hidden;
  transition: 0.5s;
}

.overlay-content {
 margin: 0;
  position: absolute;
  top: 47%;
  left: 50%;
  transform: translate(-50%, -55%);
  width: 100%;
  text-align: center;
  margin-top: 30px;
}

.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 28px;
  color: #fff;
  display: block;
  transition: 0.3s;
}

.overlay a:hover, .overlay a:focus {
  color: #f1f1f1;
}

.overlay .closebtn {
  position: absolute;
  top: -13px;
  right: 18px;
  font-size: 50px;
}

 /*ipad air*/ 
@media screen and (max-width: 1200px) {
.overlay .closebtn {
  position: absolute;
  top: -13px;
  right: 12px;
  font-size: 50px;
}

}


@media screen and (max-width: 700px) {
  .overlay {overflow-y: none;}
  .overlay a {font-size: 24px}

.overlay .closebtn {
  position: absolute;
  top: -13px;
  right: 13px;
  font-size: 50px;
}
}