diff --git a/src/wp-content/themes/twentyseventeen/style.css b/src/wp-content/themes/twentyseventeen/style.css
index 74a4715209..f69f53ea33 100644
--- a/src/wp-content/themes/twentyseventeen/style.css
+++ b/src/wp-content/themes/twentyseventeen/style.css
@@ -1690,6 +1690,24 @@ body:not(.title-tagline-hidden) .site-branding-text {
 	transform: translateX(-50%) translateY(-50%);
 }
 
+/* For browsers that support 'object-fit' */
+@supports ( object-fit: cover ) {
+	.has-header-image .custom-header-media img,
+	.has-header-video .custom-header-media video,
+	.has-header-video .custom-header-media iframe {
+		height: 100%;
+		left: 0;
+		-o-object-fit: cover;
+		object-fit: cover;
+		top: 0;
+		-ms-transform: none;
+		-moz-transform: none;
+		-webkit-transform: none;
+		transform: none;
+		width: 100%;
+	}
+}
+
 .wp-custom-header .wp-custom-header-video-button { /* Specificity prevents .color-dark button overrides */
 	background-color: rgba(34, 34, 34, 0.5);
 	border: 1px solid rgba(255, 255, 255, 0.6);