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

//
// Load core variables and mixins
// --------------------------------------------------

@import 'variables.less';
@import 'mixins.less';

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

// Common styles
.btn-default,
.btn-primary,
.btn-success,
.btn-info,
.btn-warning,
.btn-danger {
  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.2);
  @shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    0 1px 1px rgba(0, 0, 0, 0.075);
  .box-shadow(@shadow);

  // Reset the shadow
  &:active,
  &.active {
    .box-shadow(inset 0 3px 5px rgba(0, 0, 0, 0.125));
  }
}

// Mixin for generating new styles
.btn-styles(@btn-color: #555) {
  // prettier-ignore
  #gradient >
    .vertical(@start-color: @btn-color; @end-color: darken(@btn-color, 12%));
  .reset-filter(

  ); // Disable gradients for IE9 because filter bleeds through rounded corners
  background-repeat: repeat-x;
  border-color: darken(@btn-color, 14%);

  &:hover,
  &:focus {
    background-color: darken(@btn-color, 12%);
    background-position: 0 -15px;
  }

  &:active,
  &.active {
    background-color: darken(@btn-color, 12%);
    border-color: darken(@btn-color, 14%);
  }
}

// Common styles
.btn {
  // Remove the gradient for the pressed/active state
  &:active,
  &.active {
    background-image: none;
  }
}

// Apply the mixin to the buttons
.btn-default {
  .btn-styles(@btn-default-bg);
  text-shadow: 0 1px 0 #fff;
  border-color: #ccc;
}
.btn-primary {
  .btn-styles(@btn-primary-bg);
}
.btn-success {
  .btn-styles(@btn-success-bg);
}
.btn-info {
  .btn-styles(@btn-info-bg);
}
.btn-warning {
  .btn-styles(@btn-warning-bg);
}
.btn-danger {
  .btn-styles(@btn-danger-bg);
}

//
// Images
// --------------------------------------------------

.thumbnail,
.img-thumbnail {
  .box-shadow(0 1px 2px rgba(0, 0, 0, 0.075));
}

//
// Dropdowns
// --------------------------------------------------

.dropdown-menu > li > a:hover,
.dropdown-menu > li > a:focus {
  // prettier-ignore
  #gradient >
    .vertical(
      @start-color: @dropdown-link-hover-bg; @end-color:
        darken(@dropdown-link-hover-bg, 5%)
    );
  background-color: darken(@dropdown-link-hover-bg, 5%);
}
.dropdown-menu > .active > a,
.dropdown-menu > .active > a:hover,
.dropdown-menu > .active > a:focus {
  // prettier-ignore
  #gradient >
    .vertical(
      @start-color: @dropdown-link-active-bg; @end-color:
        darken(@dropdown-link-active-bg, 5%)
    );
  background-color: darken(@dropdown-link-active-bg, 5%);
}

//
// Navbar
// --------------------------------------------------

// Default navbar
.navbar-default {
  // prettier-ignore
  #gradient >
    .vertical(
      @start-color: lighten(@navbar-default-bg, 10%) ; @end-color:
        @navbar-default-bg
    );
  .reset-filter(

  ); // Remove gradient in IE<10 to fix bug where dropdowns don't get triggered
  border-radius: @navbar-border-radius;
  @shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    0 1px 5px rgba(0, 0, 0, 0.075);
  .box-shadow(@shadow);

  .navbar-nav > .active > a {
    // prettier-ignore
    #gradient >
      .vertical(
        @start-color: darken(@navbar-default-bg, 5%) ; @end-color:
          darken(@navbar-default-bg, 2%)
      );
    .box-shadow(inset 0 3px 9px rgba(0, 0, 0, 0.075));
  }
}
.navbar-brand,
.navbar-nav > li > a {
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.25);
}

// Inverted navbar
.navbar-inverse {
  // prettier-ignore
  #gradient >
    .vertical(
      @start-color: lighten(@navbar-inverse-bg, 10%) ; @end-color:
        @navbar-inverse-bg
    );
  .reset-filter(

  ); // Remove gradient in IE<10 to fix bug where dropdowns don't get triggered

  .navbar-nav > .active > a {
    // prettier-ignore
    #gradient >
      .vertical(
        @start-color: @navbar-inverse-bg; @end-color:
          lighten(@navbar-inverse-bg, 2.5%)
      );
    .box-shadow(inset 0 3px 9px rgba(0, 0, 0, 0.25));
  }

  .navbar-brand,
  .navbar-nav > li > a {
    text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
  }
}

// Undo rounded corners in static and fixed navbars
.navbar-static-top,
.navbar-fixed-top,
.navbar-fixed-bottom {
  border-radius: 0;
}

//
// Alerts
// --------------------------------------------------

// Common styles
.alert {
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.2);
  @shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25),
    0 1px 2px rgba(0, 0, 0, 0.05);
  .box-shadow(@shadow);
}

// Mixin for generating new styles
.alert-styles(@color) {
  // prettier-ignore
  #gradient > .vertical(@start-color: @color; @end-color: darken(@color, 7.5%));
  border-color: darken(@color, 15%);
}

// Apply the mixin to the alerts
.alert-success {
  .alert-styles(@alert-success-bg);
}
.alert-info {
  .alert-styles(@alert-info-bg);
}
.alert-warning {
  .alert-styles(@alert-warning-bg);
}
.alert-danger {
  .alert-styles(@alert-danger-bg);
}

//
// Progress bars
// --------------------------------------------------

// Give the progress background some depth
.progress {
  // prettier-ignore
  #gradient >
    .vertical(@start-color: darken(@progress-bg, 4%) ; @end-color: @progress-bg);
}

// Mixin for generating new styles
.progress-bar-styles(@color) {
  // prettier-ignore
  #gradient > .vertical(@start-color: @color; @end-color: darken(@color, 10%));
}

// Apply the mixin to the progress bars
.progress-bar {
  .progress-bar-styles(@progress-bar-bg);
}
.progress-bar-success {
  .progress-bar-styles(@progress-bar-success-bg);
}
.progress-bar-info {
  .progress-bar-styles(@progress-bar-info-bg);
}
.progress-bar-warning {
  .progress-bar-styles(@progress-bar-warning-bg);
}
.progress-bar-danger {
  .progress-bar-styles(@progress-bar-danger-bg);
}

//
// List groups
// --------------------------------------------------

.list-group {
  border-radius: @border-radius-base;
  .box-shadow(0 1px 2px rgba(0, 0, 0, 0.075));
}
.list-group-item.active,
.list-group-item.active:hover,
.list-group-item.active:focus {
  text-shadow: 0 -1px 0 darken(@list-group-active-bg, 10%);
  // prettier-ignore
  #gradient >
    .vertical(
      @start-color: @list-group-active-bg; @end-color:
        darken(@list-group-active-bg, 7.5%)
    );
  border-color: darken(@list-group-active-border, 7.5%);
}

//
// Panels
// --------------------------------------------------

// Common styles
.panel {
  .box-shadow(0 1px 2px rgba(0, 0, 0, 0.05));
}

// Mixin for generating new styles
.panel-heading-styles(@color) {
  // prettier-ignore
  #gradient > .vertical(@start-color: @color; @end-color: darken(@color, 5%));
}

// Apply the mixin to the panel headings only
.panel-default > .panel-heading {
  .panel-heading-styles(@panel-default-heading-bg);
}
.panel-primary > .panel-heading {
  .panel-heading-styles(@panel-primary-heading-bg);
}
.panel-success > .panel-heading {
  .panel-heading-styles(@panel-success-heading-bg);
}
.panel-info > .panel-heading {
  .panel-heading-styles(@panel-info-heading-bg);
}
.panel-warning > .panel-heading {
  .panel-heading-styles(@panel-warning-heading-bg);
}
.panel-danger > .panel-heading {
  .panel-heading-styles(@panel-danger-heading-bg);
}

//
// Wells
// --------------------------------------------------

.well {
  // prettier-ignore
  #gradient >
    .vertical(@start-color: darken(@well-bg, 5%) ; @end-color: @well-bg);
  border-color: darken(@well-bg, 10%);
  @shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 0 rgba(255, 255, 255, 0.1);
  .box-shadow(@shadow);
}