html, body {
    overflow: hidden;
    width   : 100%;
    height  : 100%;
    margin  : 0;
    padding : 0;
}
#renderCanvas {
    width   : 100%;
    height  : 100%;
    touch-action: none;
}
 /* The Overlay (background) */
.overlay {
    /* Height & width depends on how you want to reveal the overlay (see JS below) */   
    height: 0;
    width: 100%;
    /*position: fixed; /* Stay in place */
    /*z-index: 1; /* Sit on top */
    /* left: 0; */
    /* top: 0; */
    background-color: rgb(0,0,0); /* Black fallback color */
    background-color: rgba(0,0,0, 0.9); /* Black w/opacity */
    /*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 */
    height : 100%;
    /*text-align: center; /* Centered text/links */
    /*margin-top: 30px; /* 30px top margin to avoid conflict with the close button on smaller screens */
}

/* The navigation links inside the overlay */
/* .overlay a {
    padding: 8px;
    text-decoration: none;
    font-size: 36px;
    color: #818181;
    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 {
    color: #f1f1f1;
} */

/* Position the close button (top right corner) */
/* .overlay .closebtn {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 60px;
} */

/* When the height of the screen is less than 450 pixels, change the font-size of the links and position the close button again, so they don't overlap */
/* @media screen and (max-height: 450px) {
    .overlay a {
        font-size: 20px
    }
    .overlay .closebtn {
        font-size: 40px;
        top: 15px;
        right: 35px;
    }
}  */