WordPress/wp-includes/blocks/rss/editor.css

/**
 * Colors
 */
/**
 * Breakpoints & Media Queries
 */
/**
 * SCSS Variables.
 *
 * Please use variables from this sheet to ensure consistency across the UI.
 * Don't add to this sheet unless you're pretty sure the value will be reused in many places.
 * For example, don't add rules to this sheet that affect block visuals. It's purely for UI.
 */
/**
 * Colors
 */
/**
 * Fonts & basic variables.
 */
/**
 * Grid System.
 * https://make.wordpress.org/design/2019/10/31/proposal-a-consistent-spacing-system-for-wordpress/
 */
/**
 * Dimensions.
 */
/**
 * Shadows.
 */
/**
 * Editor widths.
 */
/**
 * Block & Editor UI.
 */
/**
 * Block paddings.
 */
/**
 * React Native specific.
 * These variables do not appear to be used anywhere else.
 */
/**
 * Breakpoint mixins
 */
/**
 * Long content fade mixin
 *
 * Creates a fading overlay to signify that the content is longer
 * than the space allows.
 */
/**
 * Focus styles.
 */
/**
 * Applies editor left position to the selector passed as argument
 */
/**
 * Styles that are reused verbatim in a few places
 */
/**
 * Allows users to opt-out of animations via OS-level preferences.
 */
/**
 * Reset default styles for JavaScript UI based pages.
 * This is a WP-admin agnostic reset
 */
/**
 * Reset the WP Admin page styles for Gutenberg-like pages.
 */
.wp-block-rss li a > div {
  display: inline;
}

.wp-block-rss__placeholder-form {
  display: flex;
  align-items: stretch;
}
.wp-block-rss__placeholder-form > * {
  margin-bottom: 8px;
}
@media (min-width: 782px) {
  .wp-block-rss__placeholder-form > * {
    margin-bottom: 0;
  }
}

.wp-block-rss__placeholder-input {
  display: flex;
  align-items: stretch;
  flex-grow: 1;
}
.wp-block-rss__placeholder-input .components-base-control__field {
  margin: 0;
  display: flex;
  align-items: stretch;
  flex-grow: 1;
  margin-right: 8px;
}