.mouse__arw span
{
  display: block;
  width: 15px;
  height: 15px;
  -ms-transform: rotate(45deg); /* IE 9 */
  -webkit-transform: rotate(45deg); /* Chrome, Safari, Opera */
  transform: rotate(45deg);   
  border-right: 2px solid white;
  border-bottom: 2px solid white;
  margin: 0 0 -5px ;
}
.unu
{
  margin-top: 6px;
}
.unu, .doi
{
    -webkit-animation: mouse-scroll 1s infinite;
    -moz-animation: mouse-scroll 1s infinite;
}
.unu
{
  -webkit-animation-delay: .1s;
  -moz-animation-delay: .1s;
  -webkit-animation-direction: alternate;
}
.doi
{
  -webkit-animation-delay: .2s;
  -moz-animation-delay: .2s;
  -webkit-animation-direction: alternate;
}
@-webkit-keyframes mouse-wheel
{
   0% {
    opacity: 1;
    -webkit-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
  }

  100% {
    opacity: 0;
    -webkit-transform: translateY(6px);
    -ms-transform: translateY(6px);
    transform: translateY(6px);
  }
}
@-webkit-keyframes mouse-scroll {

  0%   { opacity: 0;}
  50%  { opacity: .5;}
  100% { opacity: 1;}
}
@-moz-keyframes mouse-scroll {

  0%   { opacity: 0; }
  50%  { opacity: .5; }
  100% { opacity: 1; }
}
@-o-keyframes mouse-scroll {

  0%   { opacity: 0; }
  50%  { opacity: .5; }
  100% { opacity: 1; }
}
@keyframes mouse-scroll {

  0%   { opacity: 0; }
  50%  { opacity: .5; }
  100% { opacity: 1; }
}