HTML structure does not allow solving it by custom CSS. Such modification requires complicated Woocommerce code customization which is not covered by our support. You will need to find a developer who would customize the product page as per your needs.
Then check the problem. If the problem persists, deactivate all the plugins not related to the theme and switch the parent theme, check the issue, If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.