themes-wordpress/spearhead/assets/sass/block-extends/_search.scss

.wp-block-search {

	&.wp-block-search__button-inside {
		.wp-block-search__inside-wrapper{
			padding: 0;
			.wp-block-search__button {
				padding: var(--button--padding-vertical) var(--button--padding-horizontal);
				border-top-left-radius: 0;
				border-bottom-left-radius: 0;
				margin: -1px -1px -1px 0;
			}
		}

		&:not(.wp-block-search__icon-button) {
			.wp-block-search__inside-wrapper{
				border-radius: var(--button--border-radius);
			}
		}

		&.wp-block-search__icon-button {

			.wp-block-search__inside-wrapper{
				flex-direction: row-reverse;
				padding-left: 0;
				border: none;
				border-bottom: var(--form--border-width) solid var(--form--border-color);
			}
	
			.wp-block-search__input {
				border: none;
				padding: 0 0 0 10px;
			}
	
			.wp-block-search__button {
				&.has-icon {
					margin-left: 0;
					background: transparent;
					color: var(--form--border-color);
					padding: 0;
					border: none;
				}
			}

		}
	}

	.wp-block-search__inside-wrapper {
		color: var(--global--color-secondary);
		align-items: center;
	}

	.wp-block-search__label {
		margin-bottom: 1rem;
	}

	.wp-block-search__input {
		color: var(--form--color-text);
		margin-right: calc( .1 * var(--global--spacing-horizontal));
		border: none;
		border-bottom: var(--form--border-width) solid var(--form--border-color);
	}
}