Changing Submit Button Color

Looks like you got this sorted out, right?

Please keep in mind that if you edited your theme files directly as it looks like you’ve done, you will lose all your changes the next time the theme is updated.

Instead of editing your theme’s stylesheet directly, I’d suggest you protect your changes via a plugin, so they won’t be overwritten every time you update Sela to the latest version. Since you’re already using Jetpack, an easy way to add custom CSS is to activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.