asaraswat

thanks for quick reply! i’ve never edited code before, though, and i don’t think i did it right.
is it supposed to be:

}
.header-image {
margin-top: 24px;
margin-top: 1.714285714rem;
}

.header-image {
width: 100%;
max-width: 100%;
}

/* Navigation Menu */
.main-navigation {
margin-top: 24px;
margin-top: 1.714285714rem;
text-align: center;
}

because it’s not working

I’m having the same issue.
If you go to https://truly-possible.com and maximize the browser, the header does not stretch all the way across.
This banner image is over 1000 pixels wide.