themes/claro/css/components/form--select.pcss.css
/**
 * @file
 * Select input elements.
 */

.form-element--type-select {
  padding-inline-end: calc(2rem - var(--input-border-size));
  background-image: url(../../images/icons/545560/chevron-down.svg);
  background-repeat: no-repeat;
  background-position: 100% 50%;
  background-size: 2.75rem 0.5625rem; /* w: 14px + (2 * 15px), h: 9px */

  /**
   * Select states.
   */
  &:focus {
    background-image: url(../../images/icons/003ecc/chevron-down.svg);
  }
  &[disabled] {
    background-image: url(../../images/icons/8e929c/chevron-down.svg);
  }

  [dir="rtl"] & {
    background-position: 0 50%;
  }

  .no-touchevents & {
    &.form-element--extrasmall,
    &[name$="][_weight]"] {
      padding-inline-end: calc(1.5rem - var(--input-border-size));
      background-size: 1.75rem 0.4375rem; /* w: 14px + (2 * 7px), h: 7px */
    }
  }
}

@media (forced-colors: active) {
  .form-element--type-select,
  .form-element--type-select:focus,
  .form-element--type-select[disabled] {
    padding-inline-end: var(--input-padding-horizontal);
    background-image: none;
    appearance: revert; /* Revert <select> appearance value for modern browsers. */
  }
}
