Overleaf/services/web/frontend/stylesheets/components/buttons.less

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

// Base styles
// --------------------------------------------------

.btn when(@is-new-css = false) {
  display: inline-block;
  margin-bottom: 0; // For input.btn
  font-weight: @btn-font-weight;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  background-image: none; // Reset unusual Firefox-on-Android default style; see https://github.com/necolas/normalize.css/issues/214
  border: @btn-border-width solid transparent;
  border-bottom: @btn-border-bottom-width solid transparent;
  white-space: nowrap;
  .button-size(
    @padding-base-vertical; @padding-base-horizontal; @font-size-base;
      @line-height-base; @btn-border-radius-base
  );
  .user-select(none);

  &,
  &:active,
  &.active {
    &:focus {
      .tab-focus();
    }
  }

  &:hover,
  &:focus {
    color: @btn-default-color;
    text-decoration: none;
  }

  &:active,
  &.active {
    outline: 0;
    background-image: none;
    .box-shadow(inset 0 3px 5px rgba(0, 0, 0, 0.125));
  }

  &.disabled,
  &[disabled],
  fieldset[disabled] & {
    cursor: not-allowed;
    pointer-events: none; // Future-proof disabling of clicks
    .opacity(0.65);
    .box-shadow(none);
  }
}
.btn when(@is-new-css = true) {
  display: inline-block;
  margin-bottom: 0; // For input.btn
  font-weight: @btn-font-weight;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  border: 0 solid transparent;
  white-space: nowrap;
  .button-size(
    @padding-base-vertical; @padding-base-horizontal; @font-size-base;
      @line-height-base; @btn-border-radius-base
  );
  .user-select(none);

  &,
  &:active,
  &.active {
    &:focus {
      .tab-focus();
    }
  }

  &:hover,
  &:focus {
    color: @btn-default-color;
    text-decoration: none;
  }

  // &:active,
  // &.active {
  // }

  &.disabled,
  &[disabled],
  fieldset[disabled] & {
    &,
    &:hover,
    &:focus,
    &:active,
    &.active {
      cursor: not-allowed;
      opacity: 1; //needed to override deprecated styling in individual classes
      .box-shadow(none);
    }
  }

  &.disabled.btn-info,
  &.disabled.btn-default,
  &[disabled].btn-info,
  &[disabled].btn-default,
  fieldset[disabled].btn-info,
  fieldset[disabled].btn-default & {
    // style only for deprecated classes
    .opacity(0.65);
  }
}

// Alternate buttons
// --------------------------------------------------

.btn-default {
  .button-variant(@btn-default-color; @btn-default-bg; @btn-default-border);
}
.btn-default-outline {
  .button-outline-variant(@btn-default-bg);
}
.btn-primary when (@is-new-css = false) {
  .button-variant(@btn-primary-color; @btn-primary-bg; @btn-primary-border);
}
.btn-primary when (@is-new-css = true) {
  .btn-borderless();
}
.btn-primary-on-primary-bg {
  .button-variant(@white; @ol-dark-green; @ol-dark-green);
}
// Success appears as green
.btn-success {
  .btn-primary;
}

// Info appears as blue-green
.btn-info {
  .button-variant(@btn-info-color; @btn-info-bg; @btn-info-border);
}
// Warning appears as orange
.btn-warning {
  .button-variant(@btn-warning-color; @btn-warning-bg; @btn-warning-border);
}
// Danger and error appear as red
.btn-danger when(@is-new-css = false) {
  .button-variant(@btn-danger-color; @btn-danger-bg; @btn-danger-border);
}
.btn-danger when(@is-new-css = true) {
  .btn-borderless(@white, @red, @red-60);
}
// Danger Ghost and error appear as light red with no border
.btn-danger-ghost when (@is-new-css = false) {
  .button-variant(@btn-danger-ghost-color; @btn-danger-ghost-bg; @btn-danger-ghost-border);
  // hover for ghost acts different from typical variants, as it's default state has no bg
  &:hover {
    background-color: @red-10;
  }
}
.btn-danger-ghost when (@is-new-css = true) {
  .btn-borderless(@red-50, @btn-danger-ghost-bg, @red-10);
}
// btn-secondary
.btn-secondary when(@is-new-css = false) {
  &:not(.btn-secondary-info) {
    .btn-default;
  }
}
.btn-secondary when(@is-new-css = true) {
  .btn-bordered();
}
// btn-info for old and btn-secondary for new
.btn-secondary-info when(@is-new-css = false) {
  .btn-info;
}
.btn-secondary-info when(@is-new-css = true) {
  .btn-secondary;
}

// Buttons relating to premium features have a special background
.btn-premium {
  .premium-background;
  color: @white;
}

.reset-btns {
  // reset all buttons back to their original colors
  .btn-danger {
    .btn-danger;
  }
  .btn-default {
    .btn-default;
  }
  .btn-default-outline {
    .btn-default-outline;
  }
  .btn-info {
    .btn-info;
  }
  .btn-primary {
    .btn-primary;
  }
  .btn-success {
    .btn-success;
  }
  .btn-warning {
    .btn-warning;
  }
  .btn-secondary {
    .btn-secondary;
  }
}

// Link buttons
// -------------------------

// Make a button look and behave like a link
.btn-link {
  color: @link-color;
  font-weight: normal;
  cursor: pointer;
  border-radius: 0;

  &,
  &:active,
  &[disabled],
  fieldset[disabled] & {
    background-color: transparent;
    .box-shadow(none);
  }
  &,
  &:hover,
  &:focus,
  &:active {
    border-color: transparent;
  }
  &:hover,
  &:focus {
    color: @link-hover-color;
    text-decoration: underline;
    background-color: transparent;
  }
  &[disabled],
  fieldset[disabled] & {
    &:hover,
    &:focus {
      color: @btn-link-disabled-color;
      text-decoration: none;
    }
  }

  &.btn-danger {
    color: @ol-red;

    &:hover,
    &:focus {
      color: @ol-dark-red;
    }
  }
}

.btn-inline-link {
  .btn-link();
  padding: 0;
  font-size: inherit;
  vertical-align: inherit;
}

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

.btn-xl {
  .button-size(
    @padding-large-vertical; @padding-large-horizontal; @font-size-h2;
      @line-height-large; @btn-border-radius-large
  );
}

.btn-lg {
  // line-height: ensure even-numbered height of button next to large input
  .button-size(
    @padding-large-vertical; @padding-large-horizontal; @font-size-large;
      @line-height-large; @btn-border-radius-large
  );
}
.btn-sm {
  // line-height: ensure proper height of button next to small input
  .button-size(
    @padding-small-vertical; @padding-small-horizontal; @font-size-small;
      @line-height-small; @btn-border-radius-small
  );
}
.btn-xs {
  .button-size(
    @padding-xs-vertical; @padding-xs-horizontal; @font-size-small;
      @line-height-small; @btn-border-radius-small
  );
}

// Block button
// --------------------------------------------------

.btn-block {
  display: block;
  width: 100%;
  padding-left: 0;
  padding-right: 0;
}

// Vertically space out multiple block buttons
.btn-block + .btn-block {
  margin-top: 5px;
}

// Specificity overrides
input[type='submit'],
input[type='reset'],
input[type='button'] {
  &.btn-block {
    width: 100%;
  }
}

.login-btn when(@is-new-css = true) {
  .btn;
  .btn-secondary;
  position: relative;
  padding-left: 20px;
  padding-right: 0;
}

.login-btn when(@is-new-css = false) {
  .btn;
  .btn-default;
  position: relative;
  padding-left: 20px;
  padding-right: 0;
}

.login-expand-more-btn {
  display: list-item;
}