delete code-block style from code block module scss

packages/app/src/components/ReactMarkdownComponents/CodeBlock.module.scss

@@ -13,23 +13,3 @@
   border-radius: bs.$border-radius;
   opacity: 0.8;
 }
-
-// Match react-syntax-highlighter library's oneDark style
-.code-block {
-  padding: 1em;
-  margin: 0.5em 0px;
-  overflow: auto;
-  // text-shadow: rgba(0, 0, 0, 0.3) 0px 1px; // Comment out because it stands out when highlighted.
-  font-family:'Fira Code', 'Fira Mono', Menlo, Consolas, 'DejaVu Sans Mono', monospace;
-  hyphens: none;
-  line-height: 1.5;
-  color: rgb(171, 178, 191);
-  text-align: left;
-  word-break: normal;
-  tab-size: 2;
-  white-space: pre;
-  background-color: rgb(40, 44, 52);
-  border-radius: 0.3em;
-  word-spacing: normal;
-  direction: ltr;
-}