Custom SharePoint Caption

Fixed font size and with background captions in SharePoint video player (No Flicker)
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// ==UserScript==
// @name         Custom SharePoint Caption
// @namespace    http://tampermonkey.net/
// @version      1.7
// @description  Fixed font size and with background captions in SharePoint video player (No Flicker)
// @match        https://v6v10-my.sharepoint.com/*
// @grant        none
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    const FONT_SIZE = '30px';
    const BG_COLOR = 'rgba(0, 0, 0, 0.75)';
    const BORDER_RADIUS = '8px';
    const PADDING = '10px 15px';

    const cssStyles = `
        .captions {
            --oneplayer-caption-text-size: ${FONT_SIZE} !important;
            font-size: ${FONT_SIZE} !important;
            background-color: ${BG_COLOR} !important;
            border-radius: ${BORDER_RADIUS} !important;
            padding: ${PADDING} !important;
            display: inline-block !important;
            white-space: normal !important;
            margin: 0 !important;
            border: none !important;
            transition: background-color 0.1s, padding 0.1s;
        }

        .captions.hide-bg {
            background-color: transparent !important;
            padding: 0 !important;
        }

        .captions-section {
            bottom: 30px !important;
            top: auto !important;
            text-align: center !important;
        }

        .video-player-container .captions-region {
            position: absolute !important;
            bottom: 0px !important;
            left: 0px !important;
            right: 0px !important;
            width: 100% !important;
            height: 100% !important;
            background-color: transparent !important;
        }
    `;

    const styleElement = document.createElement('style');
    styleElement.type = 'text/css';
    styleElement.appendChild(document.createTextNode(cssStyles));
    document.head.appendChild(styleElement);

    const observer = new MutationObserver(() => {
        const captions = document.querySelectorAll('.captions');
        captions.forEach(caption => {
            if (caption.textContent.trim() === '') {
                caption.classList.add('hide-bg');
            } else {
                caption.classList.remove('hide-bg');
            }
        });
    });

    observer.observe(document.body, {
        childList: true,
        subtree: true,
        characterData: true
    });

})();