webawesome/src/components/popup/popup.styles.ts

import { css } from 'lit';
import componentStyles from '../../styles/component.styles.js';

export default css`
  ${componentStyles}

  :host {
    --arrow-color: var(--wa-color-black);
    --arrow-size: var(--wa-tooltip-arrow-size);

    /*
     * These properties are computed to account for the arrow's dimensions after being rotated 45º. The constant
     * 0.7071 is derived from sin(45), which is the diagonal size of the arrow's container after rotating.
     */
    --arrow-size-diagonal: calc(var(--arrow-size) * 0.7071);
    --arrow-padding-offset: calc(var(--arrow-size-diagonal) - var(--arrow-size));

    display: contents;
  }

  .popup {
    position: absolute;
    isolation: isolate;
    max-width: var(--auto-size-available-width, none);
    max-height: var(--auto-size-available-height, none);
  }

  .popup--fixed {
    position: fixed;
  }

  .popup:not(.popup--active) {
    display: none;
  }

  .popup__arrow {
    position: absolute;
    width: calc(var(--arrow-size-diagonal) * 2);
    height: calc(var(--arrow-size-diagonal) * 2);
    rotate: 45deg;
    background: var(--arrow-color);
    z-index: -1;
  }
`;