Fixed $content_width

[metbril]

The variable $content_width is set at the top of functions.php, but is set fixed later on in function sempress_content_width().

As as result, there is no (easy) way to set a different width in a child theme, by simply adding

$content_width = 800; /* pixels */

to the functions.php of the child theme.

My suggestion would be to modify the sempress_content_width() function to respect (so related to / computed based on) the value that is set at the top of the functions file.