Product gallery not in line

Try this in your custom css:

.woocommerce #content div.product div.thumbnails a.last,
.woocommerce div.product div.thumbnails a.last,
.woocommerce-page #content div.product div.thumbnails a.last,
.woocommerce-page div.product div.thumbnails a.last
{margin-right: 3.8%}

If your theme does not have a setting where you can enter custom css, you can use a plugin like this one:
https://www.ads-software.com/plugins/simple-custom-css/

hello Lorro, i’ve tried to do this in custom css (section; product-thumbnails), just at the bottom of the text….(I’m not very skilled in wordpress)
but then I get an error massage where the pictures should be…?!

What was the error message? If possible, please put the css back in temporarily so the problem can be diagnosed.

the message is:

Parse error: syntax error, unexpected T_STRING in /home/deb79760/domains/deboktorenzijnbaasje.nl/public_html/wp-content/themes/camp/single-product/product-thumbnails.php on line 51

That’s a php file and you can’t add css to a php file.

If your theme does not have a setting where you can enter custom css, (it will be under Theme Options somewhere) you can use a plugin like this one:
https://www.ads-software.com/plugins/simple-custom-css/