Hello,

Thank you for your answer.

I'm quite new on Odoo, and don't know how to do it exactly.

I have to change the orderlines class located in:  src/odoo/addons/point_of_sale/static/src/xml/screens/receiptscreen/orderreceipt.xml

I have also a thirdparty module what is inheriting(extending) this file.

And starts as following:

Can I add something here in the beginning, to change the class or add a style to the class "orderlines" ?

When Yes, how should it look like ? 

Thanks in advance

Hi,

Create a file for the following path: module_name/static/src/css/pos.cssunder the pos.css file - 
pos-product-line {
    font-size: 14px;
}

You can also use t-style tag in your template to add the css

Copy codet-name="OrderReceipt" t-inherit="point_of_sale.OrderReceipt" t-inherit-mode="extension" owl="1">
    t-style="{'font-size':'14px'}">
        expr="//div[@class='pos-product-line']" position="attributes">
            name="style" />
       
  
It's important to note that this will change the font size of all product lines in the receipt, if you want to target a specific product line you need to use a more specific CSS selector

Hope it helps