There is a known issue with elemntor 3.7.3 > 3.7.7 that affects the page style.
For now, we suggest using or going back to version 3.6.8 until the issue will be fixed.
Steps to follow
1.Go to Elementor > Tools
2. Click the Version Control tab
3. Select version 3.6.8 and then click its Reinstall button
4. Go to General Tab
5. Regenerate CSS & Data
