themes-wordpress/modern-business/sass/site/header/_site-header.scss

// Site header

.site-header {
	padding: 1em;
	text-align: center;

	&.featured-image {
		display: flex;
		flex-direction: column;
		justify-content: space-between;
		min-height: 90vh;

		.site-branding-container {
			margin-bottom: auto;
		}
	}

	@include media(tablet) {
		margin: 0;
		padding: 2rem 0;

		&.featured-image {
			min-height: 100vh;
			margin-bottom: 2rem;
		}
	}
}

// Site branding

.site-branding {

	color: $color__text-light;
	display: flex;
	flex-direction: column;
	text-align: center;

	@include media(tablet) {
		margin: 0 $size__site-margins;
	}
}

// Site logo

.site-logo {
	order: 2;
	text-align: center;

	.custom-logo-link {
		display: inline-block;

		.custom-logo {
			max-height: 50px;
			vertical-align: top;
			width: auto;

			@include media(tablet) {
				max-height: 64px;
			}
		}
	}
}

.site-logo + .site-title,
.featured-image .site-logo + .site-title {
	margin-top: 0.5rem;
}

// Site title

.site-title {
	color: $color__text-main;
	margin: 0;
	order: 2;

	a {
		color: $color__text-main;

		&:link,
		&:visited {
			color: $color__text-main;
		}

		&:hover {
			color: $color__text-hover;
		}
	}

	.featured-image & {
		margin: 0;

		@include media(tablet) {}
	}

	/* When there is no description set, make sure navigation appears below title. */
	+ .main-navigation {
		display: block;
	}

	@include media(tablet) {}

	&:not(:empty) + .site-description:not(:empty):before {
		margin: 0 0.2em;
	}
}

// Site description

.site-description {
	color: $color__text-main;
	font-size: $font__size-xs;
	font-weight: 300;
	margin: 0 0 calc(0.5 * #{$size__spacing-unit});
	order: 1;
}