Spacing and use SCSS partial instead of CSS for accuracy

Author: James Mejia

_includes/sxs/02-extending/part-two.html

@@ -37,7 +37,7 @@ <h3 class="step">Create a custom stylesheet for our custom card component.</h3>
     <pre>mkdir _theme/components</pre>
   </div>
   <p class="step-description">
-   Now let's add our new <strong>my-card</strong> stylesheet. It's standard naming convention to prefix CSS partials with an underscore (as we've already seen in <strong>_uswds-theme</strong> and <strong>_uswds-theme-custom-styles</strong>).
+    Now let's add our new <strong>my-card</strong> stylesheet. It's standard naming convention to prefix SCSS partials with an underscore (as we've already seen in <strong>_uswds-theme</strong> and <strong>_uswds-theme-custom-styles</strong>).
   </p>
   <div class="terminal">
     <pre>touch assets/css/components/_my-card.scss</pre>