@mixin ninjalink ($link, $visit, $hover, $active) {
  a {
    color: $link;
    &:visited {
      color: $visit;
    }
    &:hover {
      color: $hover;
    }
    &:active {
      color: $active;
    }
  }
}

@mixin keyframes($animation-name) {
    @-webkit-keyframes #{$animation-name} {
        @content;
    }
    @-moz-keyframes #{$animation-name} {
        @content;
    }
    @-ms-keyframes #{$animation-name} {
        @content;
    }
    @-o-keyframes #{$animation-name} {
        @content;
    }
    @keyframes #{$animation-name} {
        @content;
    }
}