html,body{
  margin:0;
  padding:0;
  overflow:hidden;
  height:100%;
  background: url("f.jpg") repeat;
  background-size: auto;
  font-family: Arial, sans-serif;
}


canvas {
    background: transparent !important;
}

#scoreUI{
  position:absolute;
  top:10px;
  left:0;
  width:100%;
  text-align:center;
  color:white;
  font-size:35px;
  text-shadow:0 3px 8px black;
  z-index:20;
}

#gameOverUI, #rewardUI{
  position:absolute;
  top:35%;
  left:50%;
  transform:translateX(-50%);
  background:white;
  padding:20px 30px;
  border-radius:15px;
  text-align:center;
  z-index:50;
}

.hidden{
  display:none;
}

button{
  padding:10px 20px;
  font-size:20px;
  cursor:pointer;
  border-radius:8px;
  border:none;
  margin-top:15px;
}