Hi @jesus000,
We noticed that you are using the premium version of the CoachPress theme. This forum is for the free version of the theme.
The background bars are actually a background image set for the post thumbnails. Therefore it is not possible to change their colors.
But if you want to change the background image then you can add the below code in the Additional CSS field via Admin Dashboard > Appearance > Customize > Additional CSS:
.blog-section article .post-thumbnail, body.grid-layout .content-area article .post-thumbnail {
background-image: url(http://www.jesuscarreras.com.mialias.net/wp-content/uploads/2021/04/teaming-320x198.jpeg)!important;
}
Here, you can replace the image URL with the image URL of your choice.
If you face any in the future then please contact our support team via this link-https://blossomthemes.com/support-ticket/
Best regards!
Thank you very much for your help.
With the support team I already tried 2 times and got no answer. It seems that you guys are more efficient.
Best regards!