diff --git src/wp-includes/css/media-views.css src/wp-includes/css/media-views.css
index 8b50e8fdd7..388bf6ddfd 100644
--- src/wp-includes/css/media-views.css
+++ src/wp-includes/css/media-views.css
@@ -2672,45 +2672,45 @@
 }
 
 .media-frame-content[data-columns="2"] .attachment {
-	width: 50%;
+	width: 49.9%;
 }
 
 .media-frame-content[data-columns="3"] .attachment {
-	width: 33.33%;
+	width: 33.2%;
 }
 
 .media-frame-content[data-columns="4"] .attachment {
-	width: 25%;
+	width: 24.9%;
 }
 
 .media-frame-content[data-columns="5"] .attachment {
-	width: 20%;
+	width: 19.9%;
 }
 
 .media-frame-content[data-columns="6"] .attachment {
-	width: 16.66%;
+	width: 16.5%;
 }
 
 .media-frame-content[data-columns="7"] .attachment {
-	width: 14.28%;
+	width: 14.1%;
 }
 
 .media-frame-content[data-columns="8"] .attachment {
-	width: 12.5%;
+	width: 12.4%;
 }
 
 .media-frame-content[data-columns="9"] .attachment {
-	width: 11.11%;
+	width: 11%;
 }
 
 .media-frame-content[data-columns="10"] .attachment {
-	width: 10%;
+	width: 9.9%;
 }
 
 .media-frame-content[data-columns="11"] .attachment {
-	width: 9.09%;
+	width: 8.9%;
 }
 
 .media-frame-content[data-columns="12"] .attachment {
-	width: 8.33%;
+	width: 8.2%;
 }