cartodb/lib/assets/javascripts/new-dashboard/styles/hangar/_buttons.scss

//name: bg-color, font-color
$button-colors: (
  is-cartoframes: ($cartoframes, $white)
);

.button {
  display: inline-block;
  position: relative;
  padding: 16px 24px;
  overflow: hidden;
  border-radius: 8px;
  font: 600 16px/24px $title__font-family;
  text-align: center;
  white-space: nowrap;

  &.is-outline {
    padding: 14px 22px;
  }

  &:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background-color: transparent;
    transition: background-color 0.1s linear;
  }

  span {
    position: relative;
    display: inline-flex;
    overflow: hidden;
    &:before {
      content: '';
      position: absolute;
      transition: transform .3s ease;
      left: -1px;
      bottom: 0;
      width: 100%;
      height: 2px;
      background: currentColor;
      transform:  translateX(-100%);
    }
  }

  &:hover,
  &:focus {
    text-decoration: none;

    span {
      &:before {
        transform:  translateX(0);
      }
    }
  }

  > span {
    position: relative;
  }

  @each $name, $color in $button-colors {
    &.#{$name} {
      background-color: nth($color, 1);
      color: nth($color, 2);
      &.is-outline {
        background-color: transparent;
        color: nth($color, 1);
        border: 2px solid nth($color, 1);
      }
      &.is-disabled {
        pointer-events: none;

        span {
          opacity: .5;
        }
      }
    }
  }
}

.button--arrow {
  span {
    &:after{
      content: url("data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjAiIGhlaWdodD0iMTAiIHZpZXdCb3g9IjAgMCAyMCAxMCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KICA8ZyBmaWxsPSJub25lIiBmaWxsLXJ1bGU9ImV2ZW5vZGQiPgogICAgPHBhdGggZD0iTS0yLTdoMjR2MjRILTJ6Ii8+CiAgICA8cGF0aCBmaWxsPSIjRkZGIiBkPSJNMTQuNzA3LjI5M2wtMS40MTQgMS40MTRMMTUuNTg2IDRIMHYyaDE1LjU4NmwtMi4yOTMgMi4yOTMgMS40MTQgMS40MTRMMTkuNDE0IDV6Ii8+CiAgPC9nPgo8L3N2Zz4=");
      margin-left: 12px;
    }
  }
}

.underlined-link {
  position: relative;
  display: inline-block;
  overflow: hidden;

  &:before {
    content: '';
    position: absolute;
    transition: transform .3s ease;
    left: -1px;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: currentColor;
    transform:  translateX(-100%);
  }

  &.reversed {
    &:before {
      left: unset;
      right: -1px;
      transform:  translateX(100%);
    }
  }

  &:hover:before {
    transform:  translateX(0);
  }

  &:hover {
    text-decoration: none;
  }

  &.f12 {
    &:before {
      height: 1px;
    }
  }
}

.button--small {
  font: 600 12px/16px $title__font-family;
  padding: 8px 16px;
  border-radius: 4px;

  &.is-outline {
    padding: 6px 14px;
  }

  span {
    &:before {
      height: 1px;
    }
  }
}

.button--large {
  font: 600 16px/24px $title__font-family;
}