themes-wordpress/blockbase/sass/elements/_links.scss

// Default link styles
a,
.wp-block-navigation a {
	cursor: pointer;
	text-underline-offset: 0.15em;
	text-decoration: none;

	&:hover,
	&:focus {
		text-decoration-line: underline;
	}
}

//Links that appear in the main content area
main.block-editor-block-list__layout a, // Needed for the post area
.wp-block-post a {
	text-decoration-line: underline;

	&:hover,
	&:focus {
		text-decoration: none;
	}
}

// Select the focus states of all non-wpadmin and screen reader links
a:not(.ab-item):not(.screen-reader-shortcut) {

	&:active,
	&:focus {
		outline: 1px dotted currentColor;
		text-decoration: none;
	}
}