discourse/app/assets/stylesheets/common/components/buttons.css.scss

// --------------------------------------------------
// Buttons
// --------------------------------------------------

// Base
// --------------------------------------------------

.btn {
  display: inline-block;
  margin: 0;
  padding: 6px 12px;
  font-weight: 500;
  font-size: 14px;
  line-height: 18px;
  text-align: center;
  cursor: pointer;
  &:active {
    text-shadow: none;
  }
  &[disabled], &.disabled {
    cursor: default;
    opacity: 0.4;
  }
  .fa {
    margin-right: 7px;
  }
  &.no-text {
    .fa {
      margin-right: 0;
      line-height: 10px;
    }
  }
}

// Default button
// --------------------------------------------------

.btn {
  border: none;
  color: $primary_text_color;
  font-weight: normal;
  background: lighten($secondary_background_color, 73%);

  &[href] {
    color: $btn-default-color;
  }
  &:hover {
    background: #aaa;
    color: #fff;
  }
  &:active {
    @include linear-gradient( darken(#aaa, 8%), #aaa);
  }
  &[disabled] {
    background: $btn-default-background-color;
    &:hover { color: $primary_text_color; }
    cursor: not-allowed;
  }
}

// Buttons used in admin panel
// --------------------------------------------------
.btn-admin {
  text-align:left;
}

// Primary button
// --------------------------------------------------

.btn-primary {
  border: none;
  color: $tertiary_text_color;
  font-weight: normal;
  color: #fff;
  background: $btn-primary-background-color;

  &[href] {
    color: $tertiary_text_color;
  }
  &:hover {
    color: #fff;
    background: darken($btn-primary-background-color, 12%);
  }
  &:active {
    @include linear-gradient(darken($btn-primary-background-color, 18%), darken($btn-primary-background-color, 12%));
    color: #fff;
  }
  &[disabled] {
    background: $btn-primary-background-color;
  }
}

// Danger button
// --------------------------------------------------

.btn-danger {
  color: $tertiary_text_color;
  font-weight: normal;
  background: $btn-danger-background-color;
  &[href] {
    color: $tertiary_text_color;
  }
  &:hover{
    background: $btn-danger-background-color-dark;
  }
  &:active {
    @include linear-gradient($btn-danger-background-color-dark, $btn-danger-background-color);
  }
  &[disabled] {
    background: $btn-danger-background-color;
  }
}

// Social buttons
// --------------------------------------------------

.btn-social {
  color: $tertiary_text_color;
  text-shadow: 0 1px 0 rgba($primary_shadow_color, 0.2);
  @include box-shadow(inset 0 1px 0 rgba($secondary_shadow_color, 0.1));
  &[href] {
    color: $tertiary_text_color;
  }
  &:before {
    margin-right: 7px;
    font-family: zocial;
    line-height: 0.9;
  }
  &.google {
    background: $google;
    &:before {
      content: "G";
    }
  }
  &.facebook {
    background: $facebook;
    &:before {
      content: "f";
    }
  }
  &.cas {
    background: $cas;
  }
  &.twitter {
    background: $twitter;
    &:before {
      content: "T";
    }
  }
  &.yahoo {
    background: $yahoo;
    &:before {
      content: "Y";
    }
  }
  &.github {
    background: $github;
    &:before {
      content: "g";
    }
  }
}

// Button Sizes
// --------------------------------------------------

// Small

.btn-small {
  padding: 3px 6px;
  font-size: 12px;
  line-height: 16px;
}

// Large

.btn-large {
  padding: 9px 18px;
  font-size: 16px;
  line-height: 20px;
}