body{
margin:0;
overflow:hidden;
font-family:Arial;
}

#hud{
position:absolute;
top:10px;
left:10px;
color:white;
font-size:20px;
}

#crosshair{
position:absolute;
top:50%;
left:50%;
width:20px;
height:20px;
margin-left:-10px;
margin-top:-10px;
border:2px solid white;
border-radius:50%;
}

#menu{
position:absolute;
width:100%;
height:100%;
background:black;
color:white;
display:flex;
flex-direction:column;
justify-content:center;
align-items:center;
}

#gameover{
position:absolute;
width:100%;
height:100%;
background:black;
color:red;
display:none;
flex-direction:column;
justify-content:center;
align-items:center;
font-size:40px;
}