diff --git a/app/javascript/flavours/glitch/styles/components.scss b/app/javascript/flavours/glitch/styles/components.scss
index 4973c8437f..7fcd50278f 100644
--- a/app/javascript/flavours/glitch/styles/components.scss
+++ b/app/javascript/flavours/glitch/styles/components.scss
@@ -7644,6 +7644,13 @@ img.modal-warning {
   grid-template-rows: 1fr 1fr;
   gap: 2px;
 
+  &--layout-1 {
+    // The size of single images is determined by their
+    // aspect-ratio, applied via inline style attribute
+    width: initial;
+    max-height: 460px;
+  }
+
   &--layout-2 {
     & > .media-gallery__item:nth-child(1) {
       border-end-end-radius: 0;
diff --git a/app/javascript/flavours/glitch/styles_new/mastodon/components.scss b/app/javascript/flavours/glitch/styles_new/mastodon/components.scss
index 6cd23ea05a..60752e24a4 100644
--- a/app/javascript/flavours/glitch/styles_new/mastodon/components.scss
+++ b/app/javascript/flavours/glitch/styles_new/mastodon/components.scss
@@ -7460,6 +7460,13 @@ img.modal-warning {
   grid-template-rows: 1fr 1fr;
   gap: 2px;
 
+  &--layout-1 {
+    // The size of single images is determined by their
+    // aspect-ratio, applied via inline style attribute
+    width: initial;
+    max-height: 460px;
+  }
+
   &--layout-2 {
     & > .media-gallery__item:nth-child(1) {
       border-end-end-radius: 0;