Little script to make the videos under "Watch later" for Youtube a little more cleared to see.

watched-later.js

// Get all the progress indicators
let progress = document.querySelectorAll('#progress');
// Create an array from them
progress = Array.from(progress)
// Set all the text info cards to background of red
progress.map(p => p.parentElement.parentElement.parentElement.parentElement.nextElementSibling.style.backgroundColor = 'red')