html,
body {
    height: 100%;
    margin: 0;
    overflow: hidden;
}

#map-container {
    position: relative;
    width: 100%;
    height: 100%;
}

#osm-canvas,
#gpx-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}