Header and front page problem

Set a border of zero to that image
https://www.w3schools.com/css/css_border.asp

@ Andrew Nevins, Sorry but Im really new to this. Where do I need to change the border to “None”? In styles.css, header.php or customheader.php?

With kind regards

Do you have a section of the dashboard named, “Custom CSS”, “Edit CSS” or “Custom CSS Manager”?

I have now downloaded the plugin “PC Custom CSS” and now I have “Custom CSS” in appearance.

Try putting that zero border styling:

#masthead img {
 border: 0;
}

In the Custom CSS section.

YOU ARE AMAZING! It worked ! Thank you very much!!