wp-calypso/packages/global-styles/src/components/_search-control-styles.scss

/**
 * WP.com styles for @wordpress/components search control component
 * You can use this mixin to apply the WP.com styles to the search control component

 * Usage:
 * @import "@automattic/global-styles/src/components/search-control-styles";
 * @include search-control-wpcom-styles;
 */
@mixin search-control-wpcom-styles {
	.components-search-control {
		min-width: 250px;

		.components-input-control__container {
			background: var(--studio-white);
			border-radius: 4px;

			input {
				font-size: 0.875rem;
			}

			.components-input-control__suffix svg {
				fill: var(--studio-gray-30);
			}

			.components-input-control__backdrop {
				box-shadow: 0 0 0 1px var(--studio-gray-10);
			}
		}
	}
}