*{
  margin: 0;
  padding: 0;
}
body {
  /*background-image: url('img/background.gif');*/
  background-color: #000;
  background-repeat: repeat;
  background-size: cover;
}

canvas {
  position:fixed;
  top:0;
  right:0;
  bottom:0;
  left:0;
  pointer-events: none;
  opacity: 0.5;
}

.pyro {
  display: none;
}

@keyframes fade {
    from { opacity: 1.0; }
    50% { opacity: 0.3; }
    to { opacity: 1.0; }
}                                                                                                                                                                                                                                  

@-webkit-keyframes fade {
    from { opacity: 1.0; }
    50% { opacity: 0.3; }
    to { opacity: 1.0; }
}

#play, #play-again {
  width: 100px;
  height: 20px;
  margin: 0 auto;
  margin-top: 5px;
  text-align: center;
  color: #fff;
  cursor: pointer;
  user-select: none;

  animation:fade 800ms infinite;
  -webkit-animation:fade 800ms infinite;
  font-size: 14px;
  font-weight: 400;
}

#play-again {
  display: none;
}

#player1, #player2 {
  width: 100px;
  height: 50px;
  position: absolute;
  top: 0;
  color: #fff;
  text-align: center;
  user-select: none;
}
#player1 {
  left: 0
}
#player2 {
  right: 0;
}
.container{
  width: 300px;
  height: 300px;
  box-shadow: 0 0 8px;
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.box{
  width: 100px;
  height: 100px;
  background: cadetblue;
  color: white;
  float: left;
  border: 1px solid #DDD;
  box-sizing: border-box;
  text-align: center;
  font-size: 50px;
  line-height: 100px;
  cursor: pointer;
  user-select: none;
}