Use single quotes

Author: scientificpythontranslations

content/en/case-studies/blackhole-image.md

@@ -4,11 +4,11 @@ sidebar: false
 ---
 
 {{< figure
-    src="/images/content_images/cs/blackhole.jpg"
-    title="Black Hole M87"
-    alt="black hole image"
-    attribution="(Image Credits: Event Horizon Telescope Collaboration)"
-    attributionlink="https://www.jpl.nasa.gov/images/universe/20190410/blackhole20190410.jpg" >}}
+    src='/images/content_images/cs/blackhole.jpg'
+    title='Black Hole M87'
+    alt='black hole image'
+    attribution='(Image Credits: Event Horizon Telescope Collaboration)'
+    attributionlink='https://www.jpl.nasa.gov/images/universe/20190410/blackhole20190410.jpg' >}}
 {{< /figure >}}
 
 {{< blockquote