Reply To: Hiding video controls

[Senff]

Looks like the video player CSS code is coming after your CSS. Three things you could try:

a) make sure your custom_css.css is loaded after kg-video-js-skin.css

b) add specificity to your CSS line, e.g. by adding the body tag to it:
body .kg-video-js-skin.vjs-has-started .vjs-control-bar

c) use the !important tag in your CSS (last resort — only do this if everything else fails)