Odoo 14 pdf layout problem when I print the invoice there is no styles

I have installed a odoo14 solution with docker. all works fine, but when I print an invoice pdf, the content is printed but it is not like the layout configured in the configuration.

there is no styles in the pdf printed :

can anyone help me please ? what is the problem and how i can fix it ?

when I want to install the wkhtmltopdf inside the container, I recieve this message :

Reading package lists... Done Building dependency tree
Reading state information... Done Note, selecting 'wkhtmltox' instead of 'wkhtmltopdf' wkhtmltox is already the newest version (1:0.12.5-1.buster). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I think that there is a problem in dependency.

You probably have to add the the systems parameter with key report.url and value http://127.0.0.1:8069.