Optimize reading gist files content (#186)

public/embed.scss

@@ -107,6 +107,6 @@ dl.dl-config dd {
     @apply overflow-auto whitespace-pre;
 }
 
-.chroma.preview.markdown code {
+.chroma.preview.markdown pre code {
     @apply p-4;
 }

public/style.css

@@ -167,7 +167,7 @@ dl.dl-config dd {
     @apply overflow-auto whitespace-pre !important;
 }
 
-.chroma.preview.markdown code {
+.chroma.preview.markdown pre code {
     @apply p-4 !important;
 }