How do I approve my theme's look and feel?

To approve your theme's look and feel, do the following steps;

1. Log into your instance and click on Process Checklist in the left-hand navigation. 
2. Scroll down to the BUILD section.
3. Click on the gray checkmark next to Customer: Approve theme adjustments, styles, as seen in a browser on a desktop computer, so that it turns from grey to green, as shown below.