Overleaf/services/web/frontend/stylesheets/app/editor/toolbar.less

@toolbar-height: 40px;

.toolbar {
  display: flex;
  align-items: center;
  height: @toolbar-height;
  border-bottom: @toolbar-border-bottom;

  > a,
  .toolbar-right > a {
    position: relative;
    .label {
      position: absolute;
      top: 0;
      right: 0;
      padding: 0.15em 0.6em 0.2em;
      font-size: 60%;
      pointer-events: none; // Labels were capturing button/anchor clicks.
    }
  }

  > a:focus {
    outline: none;
  }

  > a:not(.btn),
  > button,
  .toolbar-left > a:not(.btn),
  .toolbar-left > button,
  .toolbar-right > a:not(.btn),
  .toolbar-right > button {
    display: inline-block;
    color: @toolbar-icon-btn-color;
    background-color: transparent;
    padding: 4px 2px;
    line-height: 1;
    height: 24px;
    border-radius: @border-radius-small;
    &.toolbar-header-back-projects {
      padding: 5px 10px 4px;
      margin-bottom: 1px;
    }

    &:hover {
      text-shadow: @toolbar-icon-btn-hover-shadow;
      color: @toolbar-icon-btn-hover-color;
      background-color: transparent;
      text-decoration: none;
    }
    &.active,
    &:active {
      .label {
        display: none;
      }
      color: white;
      background-color: @link-color;
      box-shadow: @toolbar-icon-btn-hover-boxshadow;
      &:hover {
        color: white;
      }
    }
  }

  &.toolbar-pdf > a:not(.btn) {
    margin-right: 3px;
  }

  .btn-full-height {
    border: none;
    border-radius: 0;
    border-right: 1px solid @toolbar-header-btn-border-color;
    color: @toolbar-btn-color;
    padding: 3px 10px 5px;
    font-size: 20px;
    max-height: 39px;
    &:hover {
      text-shadow: @toolbar-btn-hover-text-shadow;
      background-color: @toolbar-btn-hover-bg-color;
      color: @toolbar-btn-hover-color;
    }
    &.active,
    &:active {
      color: @toolbar-btn-active-color;
      background-color: @toolbar-btn-active-bg-color;
      box-shadow: @toolbar-btn-active-shadow;
    }
    .label {
      top: 4px;
      right: 4px;
    }

    &.header-cobranding-logo-container {
      height: @toolbar-height - 1;
      padding: 8px 10px;
      background-color: @toolbar-header-branded-btn-bg-color;
    }
  }
  .btn-full-height-no-border {
    border-right: 0;
    border-left: 0;
  }

  .toolbar-left {
    display: flex;
    float: left;
    text-align: center;
    align-items: center;
  }

  .toolbar-right {
    display: flex;
    align-items: center;
    flex-grow: 1;
    justify-content: flex-end;
    .btn-full-height {
      border-right: 0;
      border-left: 1px solid @toolbar-header-btn-border-color;
    }
  }

  .toolbar-center {
    text-align: center;
    text-overflow: ellipsis;
    overflow: hidden;
    // At small screen sizes, center relative to the left menu and right buttons
    width: 100%;
    display: flex;
    justify-content: center;
  }

  &.toolbar-header {
    background-color: @toolbar-header-bg-color;
    box-shadow: @toolbar-header-shadow;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
  }

  &.toolbar-small {
    .toolbar-small-mixin;
  }

  &.toolbar-tall {
    .toolbar-small-mixin;
  }

  &.toolbar-alt {
    .toolbar-alt-mixin;
  }
}

.header-cobranding-logo {
  display: block;
  width: auto;
  max-height: 100%;
}

.toolbar-small-mixin() {
  height: @toolbar-small-height;
}

.toolbar-tall-mixin() {
  height: @toolbar-tall-height;
  padding-top: 10px;
}
.toolbar-alt-mixin() {
  background-color: @toolbar-alt-bg-color;
}

.toolbar-label {
  display: none;
  margin: 0 4px;
  font-size: @toolbar-font-size;
  font-weight: 600;
  margin-bottom: 2px;
  vertical-align: middle;
  text-align: left;

  @media (min-width: @screen-md-min) {
    display: inline-block;
  }

  &.toolbar-label-multiline {
    line-height: 1.1;
  }
}

.editor-dark {
  .toolbar-alt {
    background-color: darken(@editor-dark-background-color, 0%);
  }
  .toolbar {
    border-color: @editor-dark-toolbar-border-color;
    .btn-full-height {
      border-color: @editor-dark-toolbar-border-color;
      &:hover {
        background-color: black;
        color: lighten(@link-color, 10%);
      }
    }
    &.toolbar-header {
      box-shadow: none;
    }
    > a:not(.btn) {
      color: @gray;
      &:hover {
        color: @gray-light;
      }
    }
  }
}

/**************************************
	Toggle Switch
***************************************/

.toggle-wrapper {
  min-width: 200px;
  height: 24px;
}

.toggle-switch {
  position: relative;
  height: 100%;
  width: 100%;
  background-color: @toggle-switch-bg;
  border-radius: @btn-border-radius-base;
}

.toggle-switch-label {
  position: relative;
  display: block;
  font-weight: normal;
  z-index: 2;
  float: left;
  width: 50%;
  height: 100%;
  line-height: 24px;
  text-align: center;
  margin-bottom: 0;
  cursor: pointer;
  user-select: none;
  color: @text-color;
  transition: color 0.12s ease-out;
}

.toggle-switch-input {
  position: absolute;
  opacity: 0;
}

.toggle-switch-input:checked + .toggle-switch-label {
  color: #fff;
  font-weight: bold;
}

.toggle-switch-selection {
  display: block;
  position: absolute;
  z-index: 1;
  top: 2px;
  left: 2px;
  right: 2px;
  width: calc(~'50% - 2px');
  height: calc(~'100% - 4px');
  background: @toggle-switch-highlight-color;
  border-radius: @btn-border-radius-base 0 0 @btn-border-radius-base;
  transition: transform 0.12s ease-out, border-radius 0.12s ease-out;
}

.toggle-switch-input:checked:nth-child(4) ~ .toggle-switch-selection {
  transform: translate(100%);
  border-radius: 0 @btn-border-radius-base @btn-border-radius-base 0;
}

/**************************************
	Formatting buttons
***************************************/
.formatting-buttons {
  width: 100%;
  overflow: hidden;
}

.formatting-buttons-wrapper {
  display: flex;
}

.formatting-btn {
  color: @formatting-btn-color;
  background-color: @formatting-btn-bg;
  padding: 0;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: none;
  border: none;
  border-left: 1px solid @formatting-btn-border;
  border-radius: 0;

  &:hover {
    color: @formatting-btn-color;
  }
}

.formatting-btn--icon {
  min-width: 32px;
  width: 32px;
}

.formatting-btn--icon:last-of-type {
  border-right: 1px solid @formatting-btn-border;
}

.formatting-btn--more {
  padding-left: 9px;
  padding-right: 9px;

  .caret {
    margin-top: 1px;
  }
}

.formatting-icon {
  font-style: normal;
  line-height: 1.5;
}

.formatting-icon--small {
  font-size: small;
  line-height: 1.9;
}

.formatting-icon--serif {
  font-family: @font-family-serif;
}

.formatting-more {
  margin-left: auto;
}

.formatting-menu {
  min-width: auto;
  max-width: 130px;
  background-color: @formatting-menu-bg;
}

.formatting-menu-item {
  float: left;
}

.formatting-menu-item > .formatting-btn {
  border-right: none;
}

// Disable border on left-most icon in menu
.formatting-menu-item:nth-of-type(4n + 1) > .formatting-btn {
  border-left: none;
}

.toolbar.toolbar-pdf > a[disabled] {
  cursor: not-allowed;
  .opacity(0.65);
  .box-shadow(none);
}