*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:rgba(0,0,0,0)}body{background:#000}#canvas{background:#00f;position:absolute;top:50%;left:50%;max-width:100%;max-height:100%;transform:translate(-50%,-50%);border:5px solid #fff}#playerImg,#bgImg,#enemyImg{display:none}button{z-index:1;border-radius:2rem;text-align:center;font-size:20px;border:none;color:#fff;padding:10px 20px;background:linear-gradient(357deg,#4c0027,#570530,#750550 50%,#7a0bc0);background-size:auto 200%;background-position:bottom;cursor:pointer;transition:background-position .2s ease-in-out}button:hover{background-position:top}button.restart{display:none;position:absolute;width:100px;top:50vh;left:calc(50vw - 50px)}button.fullscreen{position:relative;display:block;margin:1rem auto;font-size:.9rem}button.shown{display:block}button.hidden{display:none}