body {
   /* Background from CSS3 Patterns Gallery by Nicolas Gallagher */

    background-color: #a3a29e;
    background-size: 58px 58px;
    background-position: 0px 2px, 4px 35px, 29px 31px, 33px 6px, 0px 36px, 4px 2px, 29px 6px, 33px 30px;
    background-image:
    linear-gradient(335deg, #706f6b 23px, transparent 23px),
    linear-gradient(155deg, #706f6b 23px, transparent 23px),
    linear-gradient(335deg, #706f6b 23px, transparent 23px),
    linear-gradient(155deg, #706f6b 23px, transparent 23px),
    linear-gradient(335deg, #706f6b 10px, transparent 10px),
    linear-gradient(155deg, #706f6b 10px, transparent 10px),
    linear-gradient(335deg, #706f6b 10px, transparent 10px),
    linear-gradient(155deg, #706f6b 10px, transparent 10px);
}

#arena {
   margin: 0 auto;
   margin-top: 50px;
   width: 800px;
   height: 400px;
}

#game-canvas {
   border: 1.5px solid blue; 
}

#lives {
   position: absolute;
   margin-top: -40px;
   z-index: 1;
   color: orange;
   text-shadow: 3px 3px 3px rgb(0,0,80);
   font: bold 30px fantasy;

   display: block;
   z-index: 1;
}