Display File contents on the Web Browser UI

I am looking to deploy a Web Interface to display file that has log contents. I am collecting the log details and storing them on my WebServer. I have an Apache interface that lets user download/view the file from the browser.

However, the challenge here is that they don't look pretty. I want to show them in a UI that can highlight/color contents. I tried to simply pull the contents of the file and display in a Text Area which works but that would mean doing a lot of manual work to make it fancy. Wondering if something already exist that i could re-use ?

As a future enhancement I was also hoping that the UI would find for patterns in the file and highlight them in the UI. For example, If the file contains connection refused messages just highlight them in red etc..

I am not sure if I should build something from scratch or something already exist that i can re-use ?