twentyfifteen_header_style()

88	function twentyfifteen_header_style() {89		$header_image = get_header_image();90 91		// If no custom options for text are set, let's bail.92		if ( empty( $header_image ) && display_header_text() ) {93			return;94		}95 96		// If we get this far, we have custom styles. Let's do this.97		?>98		<style type="text/css" id="twentyfifteen-header-css">99		<?php100		// Short header for when there is no Custom Header and Header Text is hidden.101		if ( empty( $header_image ) && ! display_header_text() ) :102			?>103		.site-header {104			padding-top: 14px;105			padding-bottom: 14px;106		}107 108		.site-branding {109			min-height: 42px;110		}111 112		@media screen and (min-width: 46.25em) {113			.site-header {114				padding-top: 21px;115				padding-bottom: 21px;116			}117			.site-branding {118				min-height: 56px;119			}120		}121		@media screen and (min-width: 55em) {122			.site-header {123				padding-top: 25px;124				padding-bottom: 25px;125			}126			.site-branding {127				min-height: 62px;128			}129		}130		@media screen and (min-width: 59.6875em) {131			.site-header {132				padding-top: 0;133				padding-bottom: 0;134			}135			.site-branding {136				min-height: 0;137			}138		}139			<?php140		endif;141 142		// Has a Custom Header been added?143		if ( ! empty( $header_image ) ) :144			?>145		.site-header {146 147			/*148			 * No shorthand so the Customizer can override individual properties.149			 * @see https://core.trac.wordpress.org/ticket/31460150			 */151			background-image: url(<?php header_image(); ?>);152			background-repeat: no-repeat;153			background-position: 50% 50%;154			-webkit-background-size: cover;155			-moz-background-size:    cover;156			-o-background-size:      cover;157			background-size:         cover;158		}159 160		@media screen and (min-width: 59.6875em) {161			body:before {162 163				/*164				 * No shorthand so the Customizer can override individual properties.165				 * @see https://core.trac.wordpress.org/ticket/31460166				 */167				background-image: url(<?php header_image(); ?>);