Hello @alinau,
We have confirmed that the color you have set from the theme settings and the image you have changed on the about us page from the Elementor is working correctly. You may be experiencing a cache issue. To assist you further, we have recorded a video and provided the link below for your reference. Please watch the video in its entirety and then clear your browser cache before checking back to your site.
Video Link: https://streamable.com/l5id8p
Best Regards, 8Theme’s Team