.overlay 
{
  height: 0%;
  width: 100%;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: rgb(0,0,0);
  background-color: rgba(0,0,0, 0.9);
  overflow-y: hidden;
  transition: 0.5s;
}

#overlayLogo
{
  width: 100%;
  text-align: center;
  margin-bottom: 20px;
}

#overlayLogo img
{
  width: 140px;
}

.overlay-content 
{
  position: relative;
  top: 25%;
  width: 100%;
  text-align: center;
  margin-top: 30px;
}

.overlay a 
{
  padding: 8px;
  text-decoration: none;
  display: block;
  transition: 0.3s;
  text-transform: uppercase;
  color: #c0c0c0;
  font-family: DejaVuSansBold, sans-serif;
  font-weight: bold;
  font-size: 24px;  
  letter-spacing: 0px;
}

.overlay a:hover, .overlay a:focus 
{
  color: #ffff00;
}

.overlay .closebtn 
{
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

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