editor.js/src/styles/popover.css

/** 
 * Popover styles
 *
 * @todo split into separate files popover styles
 * @todo make css variables work
 */
.ce-popover {
  --border-radius: 6px;
  --width: 200px;
  --max-height: 270px;
  --padding: 6px;
  --offset-from-target: 8px;
  --color-border: #e8e8eb;
  --color-shadow: rgba(13,20,33,0.13);
  --color-background: white;
  --color-text-primary: black;
  --color-text-secondary: #707684;
  --color-border-icon: rgb(201 201 204 / 48%);
  --color-border-icon-disabled: #EFF0F1;
  --color-text-icon-active: #388AE5;
  --color-background-icon-active: rgba(56, 138, 229, 0.1);
  --color-background-item-focus: rgba(34, 186, 255, 0.08);
  --color-shadow-item-focus: rgba(7, 161, 227, 0.08);
  --color-background-item-hover: #eff2f5;
  --color-background-item-confirm: #E24A4A;
  --color-background-item-confirm-hover: #CE4343;
  --popover-top: calc(100% + var(--offset-from-target));
  --popover-left: 0;
  --nested-popover-overlap: 4px;

  --icon-size: 20px;
  --item-padding: 3px;
  --item-height: calc(var(--icon-size) + 2 * var(--item-padding));

  &__container {
    min-width: var(--width);
    width: var(--width);
    max-height: var(--max-height);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-sizing: border-box;
    box-shadow: 0 3px 15px -3px var(--color-shadow);
    position: absolute;
    left: var(--popover-left);
    top: var(--popover-top);

    background: var(--color-background);
    display: flex;
    flex-direction: column;
    z-index: 4;
  
    opacity: 0;
    max-height: 0;
    pointer-events: none;
    padding: 0;
    border: none;
  }

  &--opened {
    .ce-popover__container {
      opacity: 1;
      padding: var(--padding);
      max-height: var(--max-height);
      pointer-events: auto;
      animation: panelShowing 100ms ease;
      border: 1px solid var(--color-border);
  
      @media (--mobile) {
        animation: panelShowingMobile 250ms ease;
      }
    }

  }

  &--open-top {
    .ce-popover__container {
      --popover-top: calc(-1 * (var(--offset-from-target) + var(--popover-height)));
    }
  }

  &--open-left {
    .ce-popover__container {
      --popover-left: calc(-1 * var(--width) + 100%);
    }
  }

  &__items {
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  &__overlay {
    @media (--mobile) {
      position: fixed;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--color-dark);
      z-index: 3;
      opacity: 0.5;
      transition: opacity 0.12s ease-in;
      will-change: opacity;
      visibility: visible;
    }

    &--hidden {
      display: none;
    }
  }


  @media (--mobile) {

    .ce-popover__container {
      --offset: 5px;
  
      position: fixed;
      max-width: none;
      min-width: calc(100% - var(--offset) * 2);
      left: var(--offset);
      right: var(--offset);
      bottom: calc(var(--offset) + env(safe-area-inset-bottom));
      top: auto;
      border-radius: 10px;
    }

    .ce-popover__search {
      display: none;
    }
  }

  &__search {
    margin-bottom: 5px;
  }

  &__nothing-found-message {
    color: var(--grayText);
    display: none;
    cursor: default;
    padding: 3px;
    font-size: 14px;
    line-height: 20px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;

    &--displayed {
      display: block;
    }
  }

  &--nested {
    .ce-popover__container {
      /* Variable --nesting-level is set via js in showNestedPopoverForItem() method */
      --popover-left: calc(var(--nesting-level) * (var(--width) - var(--nested-popover-overlap)));
      /* Variable --trigger-item-top is set via js in showNestedPopoverForItem() method */
      top: calc(var(--trigger-item-top) - var(--nested-popover-overlap));
      position: absolute;
    }
  }

  &--open-top.ce-popover--nested {
    .ce-popover__container {
      /** Bottom edge of nested popover should not be lower than bottom edge of parent popover when opened upwards */
      top: calc(var(--trigger-item-top) - var(--popover-height) + var(--item-height) + var(--offset-from-target) + var(--nested-popover-overlap));

    }
  }

  &--open-left {
    .ce-popover--nested {
      .ce-popover__container {
        --popover-left: calc(-1 * (var(--nesting-level) + 1) * var(--width) + 100%);
      }
    }
  }
}


/** 
 * Popover item styles
 */


 .ce-popover-item-separator {
   padding: 4px 3px;

   &--hidden {
    display: none;
   }

   &__line {
     height: 1px;
     background: var(--color-border);
     width: 100%;
   }
 }

 .ce-popover-item-html {
  &--hidden {
    display: none;
  }
}

 .ce-popover-item {
  --border-radius: 6px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  padding: var(--item-padding);
  color: var(--color-text-primary);
  user-select: none;

  @media (--mobile) {
    padding: 4px;
  }

  &:not(:last-of-type) {
    margin-bottom: 1px;
  }

  &__icon {
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;

    svg {
      width: var(--icon-size);
      height: var(--icon-size);
    }

    @media (--mobile){
      width: 36px;
      height: 36px;
      border-radius: 8px;

      svg {
        width: 28px;
        height: 28px;
      }
    }
  }

  &__icon--tool {
    border-radius: 5px;
    box-shadow: 0 0 0 1px var(--color-border-icon);
    background: #fff;
    margin-right: 10px;
  }

  &__title {
    font-size: 14px;
    line-height: 20px;
    font-weight: 500;

    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;

    margin-right: auto;

    @media (--mobile) {
      font-size: 16px;
    }
  }

  &__secondary-title {
    color: var(--color-text-secondary);
    font-size: 12px;
    white-space: nowrap;
    letter-spacing: -0.1em;
    padding-right: 5px;
    margin-bottom: -2px;
    opacity: 0.6;

    @media (--mobile){
      display: none;
    }
  }

  &--active {
    background: var(--color-background-icon-active);
    color: var(--color-text-icon-active);

    .ce-popover-item__icon {
      box-shadow: none;
    }
  }

  &--disabled {
    color: var(--color-text-secondary);
    cursor: default;
    pointer-events: none;

    .ce-popover-item__icon {
      box-shadow: 0 0 0 1px var(--color-border-icon-disabled);
    }
  }

  &--focused {
    &:not(.ce-popover-item--no-focus) {
      box-shadow: inset 0 0 0px 1px var(--color-shadow-item-focus);
      background: var(--color-background-item-focus) !important;
    }
  }

  &--hidden {
    display: none;
  }

  @media (--can-hover) {
    &:hover {
      cursor: pointer;
      
      &:not(.ce-popover-item--no-hover) {
        background-color: var(--color-background-item-hover);
      }

      .ce-popover-item__icon {
        box-shadow: none;
      }
    }
  }

  &--confirmation {
    background: var(--color-background-item-confirm);

    .ce-popover-item__icon {
      color: var(--color-background-item-confirm);
    }

    .ce-popover-item__title {
      color: white;
    }

    /* confirmation hover */
    &:not(.ce-popover-item--no-hover) {
      @media (--can-hover) {
        &:hover {
          background: var(--color-background-item-confirm-hover);
        }
      }
    }

    /* confirmation focus */
    &:not(.ce-popover-item--no-focus) {
      &.ce-popover-item--focused {
        background: var(--color-background-item-confirm-hover) !important;
      }
    }

  }

  &--confirmation, &--active, &--focused {
    .ce-popover-item__icon {
      box-shadow: none;
    }
  }
}


/** 
 * Animations
 */
@keyframes panelShowing {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.9);
  }

  70% {
    opacity: 1;
    transform: translateY(2px);
  }

  to {

    transform: translateY(0);
  }
}

@keyframes panelShowingMobile {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.98);
  }

  70% {
    opacity: 1;
    transform: translateY(-4px);
  }

  to {

    transform: translateY(0);
  }
}


.wobble {
  animation-name: wobble;
  animation-duration: 400ms;
}

/**
 * @author Nick Pettit - https://github.com/nickpettit/glide
 */
@keyframes wobble {
  from {
    transform: translate3d(0, 0, 0);
  }

  15% {
    transform: translate3d(-9%, 0, 0);
  }

  30% {
    transform: translate3d(9%, 0, 0);
  }

  45% {
    transform: translate3d(-4%, 0, 0);
  }

  60% {
    transform: translate3d(4%, 0, 0);
  }

  75% {
    transform: translate3d(-1%, 0, 0);
  }

  to {
    transform: translate3d(0, 0, 0);
  }
}

/**
 * Popover header styles
 */
.ce-popover-header {
  margin-bottom: 8px;
  margin-top: 4px;
  display: flex;
  align-items: center;
  
  &__text {
    font-size: 18px;
    font-weight: 600;
  }

  &__back-button {
    border: 0;
    background: transparent;
    width: 36px;
    height: 36px;
    color: var(--color-text-primary);

    svg {
      display: block;
      width: 28px;
      height: 28px;
    }
  }
}