.overlay {
    /* Height & width depends on how you want to reveal the overlay (see JS below) */   
    height: 100%;
    width: 0;
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    background-color: white; /* Black fallback color */
    overflow-x: hidden; /* Disable horizontal scroll */
    transition: 0.5s; /* 0.5 second transition effect to slide in or slide down the overlay (height or width, depending on reveal) */
  }
  
  /* Position the content inside the overlay */
  .overlay-content {
    position: relative;
    top: 25%; /* 25% from the top */
    width: 100%; /* 100% width */
    text-align: center; /* Centered text/links */
    margin-top: 30px;
  }
  
  /* The navigation links inside the overlay */
  .overlay a {
    padding: 8px;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 5px;
    font-size: 2.2em;
    font-weight: 600;
    color: #91C340;
    display: block; /* Display block instead of inline */
    transition: 0.3s; /* Transition effects on hover (color) */
  }
  
  /* When you mouse over the navigation links, change their color */
  .overlay a:hover, .overlay a:focus {
    font-size: 2.5em;
  }
  
  /* Position the close button (top right corner) */
  .overlay .closebtn {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 1.4em;
  }