.soccer {
  background: url(http://upload.wikimedia.org/wikipedia/en/e/ec/Soccer_ball.svg);
  background-size: 50px 50px;
  height: 50px;
  width: 50px;
  position: relative;
  top: 12.0em; 
  left: -1.2em;
  -webkit-animation:roll 4.5s infinite;
  -moz-animation:roll 4.5s infinite;
  animation:roll 4.5s infinite;
}

@-moz-keyframes roll {  
  0% {left:0px; -webkit-transform: rotate(-360deg);}
  50% {left:1000px; -webkit-transform: rotate(360deg);}
  100% {left:0px; -webkit-transform: rotate(-360deg);}
}
@-webkit-keyframes roll { 
  0% {left:0px; -webkit-transform: rotate(-360deg);}
  50% {left:1000px; -webkit-transform: rotate(360deg);}
  100% {left:0px; -webkit-transform: rotate(-360deg);}
}

@keyframes roll { 
  0% {left:0px; -webkit-transform: rotate(-360deg);}
  50% {left:1000px; -webkit-transform: rotate(360deg);}
  100% {left:0px; -webkit-transform: rotate(-360deg);}
}

.world-cup {
  color: #82AE6F;
  text-align: center;
}