$accent-color: $blue !default;

@mixin button($background-color: color($grey, 100), $font-color: $grey, $active-background-color: $accent-color, $active-font-color: text-color($accent-color)) {
  background-image: linear-gradient(to bottom, $background-color, darken($background-color, 8%));
  border: 0;
  border-radius: 2px;
  box-shadow: rgba(0, 0, 0, 0.14902) 0 0 0 1px inset;
  color: $font-color;
  display: inline-block;
  font-size: 11px;
  height: 26px;
  line-height: 25px;
  margin-bottom: 4px;
  outline: none;
  padding: 0 12px;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  white-space: nowrap;

  i {
    font-size: 13px;
    line-height: 11px;
    margin-right: 2px;
  }

  &:hover {
    background-image: linear-gradient(to bottom, lighten($background-color, 5%), darken($background-color, 3.5%));
    color: $font-color;
  }

  &:active {
    background-image: linear-gradient(to bottom, lighten($active-background-color, 3%), darken($active-background-color, 5%));
    color: $active-font-color;
  }
}