Theme development

In drupal exists the file "menu.html.twig" that manages all menus (i.e : administration, account-menu, tools.menu ...).

i want to customize only the tools menu and change its graphic (styles and css).
If i modify the "menu.html.twig" (in my subtheme), the modifies involve also the others menu (administration...).

How can i just customize only the tools menu leaving the other ones unmodified?

We are using drupal to make a website product configurator, the last step is to generate these results into pdf. But we came the problem that 1. we are not able to put our company contact info at top of the each page, only the first page, 2. the pictures are cut of two part when the previous page has not got enough space, so leave the other part in the next page.
We have alrady contact Adobe, so they think this problem can be fixed with the software which generating the pdf. not pdf's issue.
So please help, if you have any idea regarding this.

From where does render() function call the html element or where to render() in drupal 7 ?

How would you go about adding new classes or additional classes to an exposed filter form. There are 2 drop downs that I would like to have styles similar to the rest of the dropdowns on the site. The CSS on the other dropdowns is "form-control form-select". I don't have to use AJAX.

when I pop up a dialog.the form text align center.it is wrong.
like the image:

http://hk.themewaha.com/temp/viewsdialog.jpg

how to resolve it?
thanks!

Hi all

I'm wondering how I can code in a custom menu I called menu-main-right to sit right beside the primary menu inside the main navigation on every page?

As things stand, the navigation looks like: