gitlab-org--gitlab-foss/app/assets/stylesheets/framework/jquery.scss

.ui-widget {
  font-family: $regular_font;
  font-size: $font-size-base;

  .ui-state-default {
    border: 1px solid $white-light;
    background: $white-light;
    color: $jq-ui-default-color;
  }

  .ui-state-highlight {
    border: 0;
    background: transparent;
  }
}