misc/dialog/off-canvas/css/button.pcss.css
/**
 * @file
 * Visual styling for buttons in the off-canvas dialog.
 *
 * @internal
 */
#drupal-off-canvas-wrapper {
  --off-canvas-button-background-color: #777;
  --off-canvas-button-background-color-hover: #999;
  --off-canvas-button-text-color: #f5f5f5;
  --off-canvas-button-text-color-hover: #fff;
  --off-canvas-button-font-size: 14px;
  --off-canvas-button-padding: calc(var(--off-canvas-vertical-spacing-unit) / 2) 20px;
  --off-canvas-button-border-color: transparent;
  --off-canvas-button-border-radius: 20em;
  --off-canvas-button-font-weight: 600;
  --off-canvas-primary-button-background-color: #277abd;
  --off-canvas-primary-button-background-color-hover: #236aaf;
  --off-canvas-primary-button-text-color: #fff;
  --off-canvas-primary-button-text-color-hover: #fff;

  & .button {
    display: inline-block;
    height: auto;
    margin: 0 0 10px;
    padding: var(--off-canvas-button-padding);
    cursor: pointer;
    transition: background 0.5s ease;
    text-align: center;
    color: var(--off-canvas-button-text-color);
    border: solid 1px var(--off-canvas-button-border-color);
    border-radius: var(--off-canvas-button-border-radius);
    background: var(--off-canvas-button-background-color);
    font-family: inherit;
    font-size: var(--off-canvas-button-font-size);
    font-weight: var(--off-canvas-button-font-weight);
    line-height: normal;
    appearance: none;

    &:hover,
    &:active {
      z-index: 10;
      text-decoration: none;
      color: var(--off-canvas-button-text-color-hover);
      background-color: var(--off-canvas-button-background-color-hover);
    }

    &:disabled,
    &:disabled:active,
    &.is-disabled,
    &.is-disabled:active {
      cursor: default;
      color: #5c5c5c;
      background: #555;
      font-weight: normal;
    }
  }

  & .button--primary {
    margin-top: 15px;
    color: var(--off-canvas-primary-button-text-color);
    background: var(--off-canvas-primary-button-background-color);

    &:hover,
    &:active {
      color: var(--off-canvas-primary-button-text-color-hover);
      background: var(--off-canvas-primary-button-background-color-hover);
    }
  }

  & button.link {
    display: inline;
    transition: color 0.5s ease;
    color: var(--off-canvas-link-color);
    border: 0;
    background: transparent;
    font-size: var(--off-canvas-button-font-size);

    &:hover,
    &:focus {
      text-decoration: none;
      color: var(--off-canvas-link-color);
    }
  }

  & .button--danger {
    text-decoration: none;
    color: #c72100;
    border-radius: 0;
    font-weight: 400;

    &:hover,
    &:focus,
    &:active {
      text-decoration: none;
      color: #ff2a00;
      text-shadow: none;
    }

    &:disabled,
    &.is-disabled {
      cursor: default;
      color: #737373;
    }
  }

  .no-touchevents & .button--small {
    padding: 2px 1em;
    font-size: 13px;
  }
}
