themes-wordpress/seedlet/assets/sass/blocks/button/_style.scss

/**
 * Button
 */
button,
.button,
input[type="submit"] {
	// Extend button style
	@extend %button-style;
}

/**
 * Block Options
 */
.wp-block-button {

	font-family: var(--button--font-family);
	font-size: var(--button--font-size);
	font-weight: var(--button--font-weight);
	line-height: var(--button--line-height);

	&:not(.is-style-outline) .wp-block-button__link {
		@include button-hover-styles;
	}

	&.wp-block-button__link,
	.wp-block-button__link {
		@include button-main-styles;
	}

	// Outline Style
	&.is-style-outline {
		border: none;

		&.wp-block-button__link,
		.wp-block-button__link {
			border: var(--button--border-width) solid currentcolor;
			padding: var(--button--padding-vertical) var(--button--padding-horizontal);

			&:not(.has-background) {
				background: transparent;
			}

			&:not(.has-text-color) {
				color: var(--button--color-background);
			}

			&:not(.has-text-color),
			&.has-secondary-color{

				&:active {
					color: var(--button--color-background);
				}

				&:hover,
				&:focus,
				&.has-focus {
					color: var(--button--color-background-hover);
				}
			}
		}
	}

	// Squared Style
	&.is-style-squared .wp-block-button__link {
		border-radius: 0;
	}
}