Site has no styling

Problem: After upgrading from sbt-microsites 0.x to 1.x, my microsite has no styling at all. The target/site/css/ directory is not being generated.

Solution: You probably have the wrong version of Jekyll installed. sbt-microsites 0.x had a dependency on Jekyll 3.x, but sbt-microsites 1.x requires Jekyll 4.0.0 or newer.