You can customize your app’s design with css code :
https://doc.siberiancms.com/knowledge-base/how-to-use-the-advanced-customization-css-scss/
Here is a video that shows how to find the class of an element using the browser inspector :
- Right click on the element and choose inspect
- Click on the + to create a new style rule for this element
- Add your properties if you want to test them
- Then copy paste the created code in the scss tool in the color tab of your editor