Conditionally apply css class based on key value pair in a array, VueJS

I have an array as shown in below picture. How do I add conditional CSS class to

based on the key sender_id of the array in VueJS ?

conditions: 1)if sender_id != sender_id : add arrived class 2)if sender_id == sender_id : add delivered class.

The goal is to add CSS styling as per the arrived or delivered message in a chat application.