diff --git a/src/modules/blocks/code/RenderCode.tsx b/src/modules/blocks/code/RenderCode.tsx
index 24c4a8ae1..e189c808e 100644
--- a/src/modules/blocks/code/RenderCode.tsx
+++ b/src/modules/blocks/code/RenderCode.tsx
@@ -143,7 +143,7 @@ function RenderCodeImpl(props: RenderCodeImplProps) {
         '[data-joy-color-scheme="dark"] &': (renderPlantUML || renderMermaid) ? { backgroundColor: 'neutral.500' } : {},
 
         // fade in children buttons
-        [`&:hover > ${overlayButtonsClassName}`]: overlayButtonsActiveSx,
+        [`&:hover > .${overlayButtonsClassName}`]: overlayButtonsActiveSx,
 
         // lots more style, incl font, background, embossing, radius, etc.
         ...props.sx,
diff --git a/src/modules/blocks/html/RenderHtmlResponse.tsx b/src/modules/blocks/html/RenderHtmlResponse.tsx
index bfc1535f1..bba247481 100644
--- a/src/modules/blocks/html/RenderHtmlResponse.tsx
+++ b/src/modules/blocks/html/RenderHtmlResponse.tsx
@@ -41,7 +41,7 @@ export function RenderHtmlResponse(props: { htmlBlock: HtmlBlock, sx?: SxProps }
           p: 1.5, // this block gets a thicker border
           display: 'block',
           overflowX: 'auto',
-          [`&:hover > ${overlayButtonsClassName}`]: overlayButtonsActiveSx,
+          [`&:hover > .${overlayButtonsClassName}`]: overlayButtonsActiveSx,
           ...sx,
         }}
       >
diff --git a/src/modules/blocks/image/RenderImageURL.tsx b/src/modules/blocks/image/RenderImageURL.tsx
index 8300d0865..23aca45ad 100644
--- a/src/modules/blocks/image/RenderImageURL.tsx
+++ b/src/modules/blocks/image/RenderImageURL.tsx
@@ -164,7 +164,7 @@ export const RenderImageURL = (props: {
           // resizeable image
           '& picture': { display: 'flex', justifyContent: 'center' },
           '& img': { maxWidth: '100%', maxHeight: '100%' },
-          [`&:hover > ${overlayButtonsClassName}`]: overlayButtonsActiveSx,
+          [`&:hover > .${overlayButtonsClassName}`]: overlayButtonsActiveSx,
           '&:hover .overlay-text': overlayButtonsActiveSx,
 
           // layout