fix hljs background

4 jobs from master in 2 minutes and 49 seconds (queued for 1 second)
Status Job ID Name Coverage
  Setup
passed #29820
install

00:00:37

 
  Verify
passed #29821
lint

00:00:41

 
  Deploy
passed #29822
bundle-stable

00:00:47

passed #29823
pages

00:00:42