You have a lot of control over the look & feel of your apps.
In the app builder, under the Settings > Styles tab, you can select from three different pre-built styles or edit individual user-interface elements (e.g. button color):
Add HTML elements to any page block. In these elements you can write HTML (hypertext markup language) and CSS (cascading style sheets). Together, these two languages allow you to create a fantastic amount of custom user-interface components:
Learn just enough HTML and CSS to make your own UI components.
Using an HTML element, you can add any icon from Font Awesome v4.7. How it works:
Duplicate this Afterpattern app to see example HTML and CSS, ready for you to copy and paste into your app.
If you have a Business subscription, you can upload your own .css file to an app:
A custom .css file allows you to change almost anything about the styles of your app (you can't change any functionality; CSS is purely for editing colors, typography, etc.). Here is an example "dark mode" .css file:
