Thank you

But in this video, they change color of text, not background color

 <tree string="Maintenance" decoration-warning="status == 'en_cours'"
decoration-success="status == 'realise'"
decoration-info="status == 'verifie'"> 

i  want to color the rows with these colors, and it's not working. can u help me 

Hi,

In Odoo, the <tree> element with the decoration-type attribute is used to apply decorations to a tree view based on a specific field value. The decoration-type attribute allows you to specify a condition under which the decoration should be applied.

syntax as follows,

<tree decoration-type="field=='value'">

For example,

<record id="student_student_view_tree" model="ir.ui.view">

<field name="name">student.student.view.tree</field>

<field name="model">student.student</field>

   <field name="arch" type="xml">

       <tree string="Marks" decoration-success="state == 'excellent'"

             decoration-info="state == 'good'"

             decoration-danger="state == 'fail'"

             decoration-warning="state == 'average'">

           <field name="name"/>

           <field name="age"/>

           <field name="grade"/>

           <field name='state'/>

       </tree>

   </field>

</record>

For more details, refer to the blog:

https://www.cybrosys.com/blog/tree-view-decoration-attributes-in-odoo-17

Hope it helps,

Hi,
You can refer to this video:  How To Give Color For Tree View Records In Odoo

Sample: 
tree decoration-danger="state=='error'" decoration-muted="state=='sent'"

from the above code, decoration-danger will show red color when the value of state is error and decoration-muted will show grey color when the state is sent.

Similarly you have decoration-success, decoration-warning etc


Thanks