Let's take a look at the Style settings for your Landing Page! 😎
On the style tab, you can change a variety of styles for your Landing Page including background colors, form colors, and more depending on the template you're using.
There is an option to add Custom CSS at the bottom. This is not recommended for visual changes, as you can do most of those in the landing page editor itself.
Feel free to explore using CSS to further make your Form the way you want it to be.
Next on the sidebar menu is the advanced settings.