STEP 1: Create CSS file:-
We have to create CSS file in the following directory:
STEP 2: Give path of your CSS file:-
Now put the following code in the xml file of the report.
In this code I have inherited the “minimal_layout” template of the
layout.xml file of the report module and gave path of the CSS file.
<template id="minimal_layout_inherit" inherit_id="report.minimal_layout"> <xpath expr="//head" position="inside"> <link rel='stylesheet' href="/<module_name>/static/src/css/<file_name>.css"/> </xpath> </template>