font-awesome-animation/scss/float.scss

$faa-float-speed: 2s;
@keyframes float{
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}
.faa-float.animated,
.faa-float.animated-hover:hover,
.faa-parent.animated-hover:hover > .faa-float {
  animation: float $faa-float-speed linear infinite;
}
.faa-float.animated.faa-fast,
.faa-float.animated-hover.faa-fast:hover,
.faa-parent.animated-hover:hover > .faa-float.faa-fast {
  animation: float ($faa-float-speed * $faa-speed-coeff-fast) linear infinite;
}
.faa-float.animated.faa-slow,
.faa-float.animated-hover.faa-slow:hover,
.faa-parent.animated-hover:hover > .faa-float.faa-slow {
  animation: float ($faa-float-speed * $faa-speed-coeff-slow) linear infinite;
}