Youtube No rounded edges at all

Revert YouTube’s rounded design to square/flat layout everywhere possible. Compatible with Polymer Fixes.
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// ==UserScript==
// @name         Youtube No rounded edges at all 
// @namespace    https://github.com/
// @version      1.0
// @license MIT
// @description  Revert YouTube’s rounded design to square/flat layout everywhere possible. Compatible with Polymer Fixes.
// @match        https://www.youtube.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    "use strict";

    const css = `
        /* Remove rounded corners globally */
        * {
            border-radius: 0px !important;
        }

        /* Remove box shadows from cards and modals */
        ytd-rich-grid-media, ytd-compact-video-renderer, ytd-video-renderer,
        ytd-channel-renderer, ytd-grid-video-renderer, ytd-rich-shelf-renderer,
        ytd-rich-item-renderer, paper-button, yt-img-shadow, yt-formatted-string,
        yt-live-chat-renderer, yt-live-chat-text-message-renderer,
        ytd-playlist-video-renderer, ytd-merch-shelf-renderer {
            box-shadow: none !important;
        }

        /* Remove rounded edges from input/search fields */
        input, textarea, yt-formatted-string {
            border-radius: 0px !important;
        }

        /* Flatten buttons */
        paper-button, tp-yt-paper-icon-button, tp-yt-paper-icon-button-light {
            border-radius: 0px !important;
            box-shadow: none !important;
        }

        /* Flatten thumbnails */
        ytd-thumbnail img, yt-img-shadow img {
            border-radius: 0px !important;
        }

        /* Flatten live chat bubbles */
        yt-live-chat-text-message-renderer {
            border-radius: 0px !important;
        }

        /* Flatten modals/popups */
        ytd-popup-container, yt-dialog-renderer, tp-yt-paper-dialog {
            border-radius: 0px !important;
            box-shadow: none !important;
        }
    `;

    const style = document.createElement('style');
    style.textContent = css;
    document.documentElement.appendChild(style);
})();