diff --git a/main.css b/main.css
index d73cfbb..00b7a33 100644
--- a/main.css
+++ b/main.css
@@ -280,7 +280,7 @@
     aspect-ratio: 1.5;
   }
   iframe[src*="https://video.manchester.ac.uk"][width="960"][height="540"] {
-    aspect-ratio: 1.8777777778;
+    aspect-ratio: 1.8177777778;
   }
   iframe[src*="https://video.manchester.ac.uk"][width="660"][height="362"] {
     aspect-ratio: 1.9232044199;
diff --git a/styles/_online.manchester.ac.uk.scss b/styles/_online.manchester.ac.uk.scss
index 90a01e3..b82441f 100644
--- a/styles/_online.manchester.ac.uk.scss
+++ b/styles/_online.manchester.ac.uk.scss
@@ -329,7 +329,7 @@ iframe[src*="https://video.manchester.ac.uk"] {
 	aspect-ratio: 1.5;
 	// more specific aspect ratios...
 	&[width="960"][height="540"] {
-		aspect-ratio: calc(960 / 540 + 0.1);
+		aspect-ratio: calc(960 / 540 + 0.04);
 	}
 	&[width="660"][height="362"] {
 		aspect-ratio: calc(660 / 362 + 0.1);