styles.css

.inner-cover {
    color: white;
    text-align: center
}

.noselect {
    cursor: default;
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
    -khtml-user-select: none; /* Konqueror HTML */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Non-prefixed version, currently supported by Chrome and Opera */
}

/* immitate webkit fullscreen in firefox */
.container:-moz-full-screen {
    display: table;
    height: 100%;
    position: absolute;
    overflow: hidden;
    width: 100%;
}

.container:-moz-full-screen .helper {
    #position: absolute;
    #top: 50%;
    display: table-cell;
    vertical-align: middle;
}

.container:-moz-full-screen .canvas {
    #position: relative;
    #top: -50%;
    margin: 0 auto;
    width: 500px;
}

body {
    margin: 0;
    background-color: rgb(51, 51, 51);
}

#fscontainer {
    padding: 0;
}

#rygameCanvas {
    outline: none;
    display: block;
    margin: 0 auto;
}

.screensize-buttons {
    text-align: center;
    margin: 1em;
}