wp-calypso/client/blocks/authentication/form-divider/style.scss

@import "@automattic/onboarding/styles/mixins";
@import "@wordpress/base-styles/breakpoints";
@import "@wordpress/base-styles/mixins";

$separator-style: 1px solid #eaeaeb;
$breakpoint-mobile: 660px;

@mixin horizontal-separator {
	width: 100%;
	margin: 20px 0;
	&::before,
	&::after {
		position: absolute;
		content: "";
		border-inline-start: 0;
		border-block-start: $separator-style;
		inset-block-start: 50%;
		inset-inline-start: 0;
		height: 0;
		width: 42%;
		z-index: 1;
	}

	&::after {
		left: 58%;
	}

	.auth-form__separator-text {
		padding: 0 24px;
	}
}

@mixin vertical-separator {
	width: 24px;
	margin-left: 40px;
	margin-right: 40px;

	&::before,
	&::after {
		border-inline-start: $separator-style;
		border-block-start: 0;
		inset-block-start: 0;
		inset-inline-start: 50%;
		height: 40%;
	}

	&::after {
		top: 60%;
	}

	.auth-form__separator-text {
		padding: 24px 0;
	}
}


.auth-form__separator {
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;

	@include horizontal-separator;

	.auth-form__separator-text {
		text-transform: uppercase;
		text-align: center;
		font-size: 0.75rem;
		z-index: 1;
		color: var(--studio-gray-50);
	}
}

// In this case we want the separator to be vertical
.signup-form,
.layout:not(.is-grav-powered-client) .is-social-first,
.login form.is-woo-passwordless,
.login form.is-blaze-pro {
	.auth-form__separator {
		@include horizontal-separator;
		width: calc(100% - 32px);
		margin: 20px 0;

		@include break-medium {
			@include vertical-separator;
		}
	}

	.auth-form__separator.is-horizontal {
		@include horizontal-separator;
	}
}

// If the separator is between two cards, pull them together.
// If you want to help get rid of this, please consider removing Card component in sign up.
.card ~ .auth-form__separator {
	margin-bottom: -10px;
	margin-top: -10px;
}

// Give the first card 10px of space at the bottom to compensate for the -10px margin above.
:has(> .auth-form__separator) > .card:first-of-type {
	border-bottom: 10px solid transparent;
}

// Give the last card 10px of space at the bottom to compensate for the -10px margin above.
.auth-form__separator + .card {
	// Remove the top-edge box shadow if any.
	clip-path: polygon(-1px 1px, 102% 1px, 102% 102%, -1px 102%);
	// Compensate for the clipped 1px + the negative 10px, to keep the contents unclipped.
	border-top: 11px solid transparent;
}