Fix minor styling issues

- Fix overflow for code blocks
- Fix navbar width

client/public/assets/styling/general.css

@@ -13,6 +13,7 @@
 }
 
 nav {
+  width: 100vw;
   border-bottom-left-radius: 5px;
   border-bottom-right-radius: 5px;
 }
@@ -33,6 +34,7 @@ pre {
   border-radius: 1em;
   border-width: 1px;
   border-color: var(--text-color);
+  overflow: scroll;
 }
 
 .figure > p {