Update README.md

Author: robdodson

README.md

@@ -23,7 +23,7 @@ authoring guides and codelabs.
 git clone https://github.com/GoogleChrome/web.dev.git --recurse-submodules
 ```
 
-⚠️**Important:** We're currently in the process of open sourcing our CSS.
+⚠️ **Important:** We're currently in the process of open sourcing our CSS.
 Unfortunately the above command will only work for folks who are part of our
 team and have access to the styles submodule. We plan to resolve this in
 the second half of May. Thank you for your patience! 🙇‍♂️