woocommerce/plugins/woocommerce-blocks/assets/js/base/components/button/style.scss

.wc-block-components-button:not(.is-link) {
	align-items: center;
	display: inline-flex;
	height: auto;
	justify-content: center;
	text-align: center;
	position: relative;
	transition: box-shadow 0.1s linear;

	&:focus {
		box-shadow: 0 0 0 2px $studio-blue;
		box-shadow: inset 0 0 0 1px $white, 0 0 0 2px $studio-blue;
		outline: 3px solid transparent;
	}

	.wc-block-components-button__text {
		display: block;

		> svg {
			fill: currentColor;
		}
	}
	.wc-block-components-spinner + .wc-block-components-button__text {
		visibility: hidden;
	}

	&.text {
		color: $gray-900;

		&:hover {
			opacity: 0.9;
		}
	}

	&:disabled {
		.wc-block-components-button__text {
			opacity: 0.5;
		}
	}

	&.outlined {
		background: transparent;
		color: currentColor;

		&:not(:focus) {
			box-shadow: inset 0 0 0 1px currentColor;
		}

		&:disabled,
		&:hover,
		&:focus,
		&:active {
			background-color: $gray-900;
			color: $white;
		}

		&:hover {
			background-color: $gray-900;
			color: $white;
			opacity: 1;
		}
	}
}

body:not(.woocommerce-block-theme-has-button-styles) .wc-block-components-button:not(.is-link) {
	min-height: 3em;

	&:focus {
		box-shadow: 0 0 0 2px $studio-blue;
		box-shadow: inset 0 0 0 1px $white, 0 0 0 2px $studio-blue;
		outline: 3px solid transparent;
	}

	&.text {
		color: $gray-900;

		&:hover {
			opacity: 0.9;
		}
	}
}