diff --git a/src/wp-admin/css/themes.css b/src/wp-admin/css/themes.css
index aedecd5b32..6b598013a0 100644
--- a/src/wp-admin/css/themes.css
+++ b/src/wp-admin/css/themes.css
@@ -1852,6 +1852,22 @@ body.full-overlay-active {
 	margin: 15px 0;
 	width: 258px;
 	border: 1px solid #c3c4c7;
+	position: relative;
+	overflow: hidden;
+}
+
+.install-theme-info .theme-screenshot > img {
+	width: 100%;
+	height: auto;
+	position: absolute;
+	left: 0;
+	top: 0;
+}
+
+.install-theme-info .theme-screenshot:after {
+	content: "";
+	display: block;
+	padding-top: 66.66666666%;
 }
 
 .install-theme-info .theme-details {
diff --git a/src/wp-admin/theme-install.php b/src/wp-admin/theme-install.php
index 10aeeb344f..07a76ede7f 100644
--- a/src/wp-admin/theme-install.php
+++ b/src/wp-admin/theme-install.php
@@ -456,7 +456,9 @@ if ( $tab ) {
 						?>
 					</span>
 
-					<img class="theme-screenshot" src="{{ data.screenshot_url }}?ver={{ data.version }}" alt="" />
+					<div class="theme-screenshot">
+						<img class="theme-screenshot" src="{{ data.screenshot_url }}?ver={{ data.version }}" alt="" />
+					</div>
 
 					<div class="theme-details">
 						<# if ( data.rating ) { #>