style.css

body{
  background-color: black;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
h1,h2,h3,h4{
margin:0px;
    font-weight: bold;
    color: #333;
}
div{
    display: block;
}
.container{
    position: relative;
    background: white;
    width:700px;
    margin: 40px auto;
    padding:40px;
}
.container.flash{
  -webkit-animation-name: flashBackground;
  -webkit-animation-duration: 100ms;
  /*-webkit-animation-timing-function: ease-in-out;*/
  -webkit-animation-direction: alternate;
  -webkit-animation-iteration-count: 1;
}
@-webkit-keyframes flashBackground{
  from{
    background: white;
  }
  to{
    background: red;
  }
}

#scores{
    position: absolute;
    padding:10px;
    top:30px;
    right:40px;
    width: 200px;
    background: #ddd;
    text-align: right;
    border-radius: 3px;
}
#scores span{
    display: inline-block;
    width:50px;
}
#gameBoard{
  position: relative;
  display:block;
}
.enemy{
  /*fill: red;*/
  stroke-width: 2;
  stroke: black;
}
.player{
  fill: #fff373;
  stroke: black;
  stroke-width: 2;
}
.player.active{
  -webkit-animation-name: flash;
  -webkit-animation-duration: 500ms;
  -webkit-animation-timing-function: ease-in-out;
  -webkit-animation-direction: alternate;
  -webkit-animation-iteration-count: infinite;
}
@-webkit-keyframes flash{
  from{
    fill:#70ed3b;
    stroke:#ff2300;
    stroke-width:4;
  }
  to{
    fill:#ff2300;
    stroke:black;
    stroke-width:1;
  }
}