@-webkit-keyframes arrow-jump {
  0%   { opacity: 0;}
  100% { opacity: 1; 
        -webkit-transform: translateY(10px);
        -moz-transform: translateY(10px);
        -0-transform: translateY(10px);
        transform: translateY(10px);
    }
  
}
#arrow {

  -webkit-animation: arrow-jump 2.0s infinite; /* Safari 4+ */
  -moz-animation:    arrow-jump 2.0s infinite; /* Fx 5+ */
  -o-animation:      arrow-jump 2.0s infinite; /* Opera 12+ */
  animation:         arrow-jump 2.0s infinite; /* IE 10+, Fx 29+ */
}