Update code formatting

Author: XAMPPRocky

config.toml

@@ -1,6 +1,6 @@
 # The URL the site will be built for
 base_url = "https://blog.rust-lang.org"
-highlight_theme = "base16-ocean-dark"
+highlight_theme = "Tomorrow"
 
 # Whether to automatically compile all Sass files in the sass directory
 compile_sass = true

sass/app.scss

@@ -13,6 +13,13 @@ html {
   font-size: 62.5%;
 }
 
+pre {
+    overflow: scroll;
+    border: 1px solid $gray;
+    border-radius: 5px;
+    padding: 1rem;
+}
+
 @media screen and (min-width: 30em) {
   html {
     font-size: 75%;