mystyle.css

.center {
    text-align: center;
}

.aligns {
    text-justify: auto;
}

.img {
    float: left;
}

.white {
    color: red;
}

.hidden {
    color: white;
}

* {
    margin: 0;
    padding: 0;
}
header {
    background-color:rgba(33, 33, 33, 0.9);
    color:#ffffff;
    display:block;
    font: 14px/1.3 Arial,sans-serif;
    height:50px;
    position:relative;
    z-index:5;
}
h2{
    margin-top: 30px;
    text-align: center;
}
header h2{
    font-size: 22px;
    margin: 0 auto;
    padding: 10px 0;
    width: 80%;
    text-align: center;
}
header a, a:visited {
    text-decoration:none;
    color:#fcfcfc;
}

@keyframes move-twink-back {
    from {background-position:0 0;}
    to {background-position:-10000px 5000px;}
}
@-webkit-keyframes move-twink-back {
    from {background-position:0 0;}
    to {background-position:-10000px 5000px;}
}
@-moz-keyframes move-twink-back {
    from {background-position:0 0;}
    to {background-position:-10000px 5000px;}
}
@-ms-keyframes move-twink-back {
    from {background-position:0 0;}
    to {background-position:-10000px 5000px;}
}

@keyframes move-clouds-back {
    from {background-position:0 0;}
    to {background-position:10000px 0;}
}
@-webkit-keyframes move-clouds-back {
    from {background-position:0 0;}
    to {background-position:10000px 0;}
}
@-moz-keyframes move-clouds-back {
    from {background-position:0 0;}
    to {background-position:10000px 0;}
}
@-ms-keyframes move-clouds-back {
    from {background-position: 0;}
    to {background-position:10000px 0;}
}

.stars, .twinkling, .clouds {
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  width:100%;
  height:100%;
  display:block;
}

.stars {
  background:#000 url(http://www.script-tutorials.com/demos/360/images/stars.png) repeat top center;
  z-index:0;
}

.twinkling{
  background:transparent url(http://www.script-tutorials.com/demos/360/images/twinkling.png) repeat top center;
  z-index:1;

  -moz-animation:move-twink-back 200s linear infinite;
  -ms-animation:move-twink-back 200s linear infinite;
  -o-animation:move-twink-back 200s linear infinite;
  -webkit-animation:move-twink-back 200s linear infinite;
  animation:move-twink-back 200s linear infinite;
}

.clouds{
    background:transparent url(http://www.script-tutorials.com/demos/360/images/clouds3.png) repeat top center;
    z-index:3;

  -moz-animation:move-clouds-back 200s linear infinite;
  -ms-animation:move-clouds-back 200s linear infinite;
  -o-animation:move-clouds-back 200s linear infinite;
  -webkit-animation:move-clouds-back 200s linear infinite;
  animation:move-clouds-back 200s linear infinite;
}

.tuna {
    /* steps causes the animation to chunk into 12 equal pieces */
    animation: walk-cycle 1s steps(12) infinite;
    background: url(http://stash.rachelnabors.com/img/codepen/tuna_sprite.png) 0 0 no-repeat; 
    height: 200px;
    width: 400px;
    margin: 100px auto 0;
  }
  
  @keyframes walk-cycle {  
    0% {background-position: 0 0; } 
    100% {background-position: 0 -2391px; } /* Must be full height of sprite or skipping will happen.*/
  }