WideGPT: Simply makes your ChatGPT conversations wider. Convenient if you're using a computer monitor produced after 1999.

widegpt.css

/* ==UserStyle==
@name         WideGPT
@version      0.1
@namespace    https://tryfinally.dev/
@description  Simply makes your ChatGPT conversations wider. Convenient if you're using a computer monitor produced after 1999.
@author       tryfinally.dev
==/UserStyle== */

@-moz-document domain("chat.openai.com") {
.xl\:max-w-3xl { max-width: 90% !important; }
  
/* uncomment to hide the "Enable chat history" button: */
/* .w-full.mt-4.btn-primary.relative.btn:has(svg) { display: none; } */
}

widegpt.user.js

// ==UserScript==
// @name         WideGPT
// @namespace    https://tryfinally.dev/
// @version      0.1
// @description  Simply makes your ChatGPT conversations wider. Convenient if you're using a computer monitor produced after 1999.
// @author       tryfinally.dev
// @match        https://chat.openai.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=openai.com
// @grant        none
// ==/UserScript==

(function() {
  'use strict';
  const style = document.createElement('style');
  style.type = 'text/css';
  style.innerHTML = '.xl\\:max-w-3xl { max-width: 90% !important; }';
  document.head.appendChild(style);
})();