html, body {
    margin: 0 !important;
    padding: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    overflow: hidden !important;
    position: fixed !important;
}


#gameBox {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
}

.arrow { 
position: absolute; 
background: none; 
width: 3em; 
height: 3em; 
}

#uArrow { 
top:0px; 
width: 100%; 
}

#dArrow { 
bottom:0px; 
width: 100%; 
}

#lArrow { 
left:0px; 
height: 100%; 
}

#rArrow { 
right:0px; 
height: 100%; 
}