fix: code snippet caused the layout to break #1329

Author: shuashuai

ui/src/index.scss

@@ -251,6 +251,7 @@ img[src=''] {
     border-radius: 0.25rem;
     padding: 1rem;
     max-height: 38rem;
+    white-space: normal;
   }
   blockquote {
     border-left: 0.25rem solid #ced4da;