Paste this into the browser console (F12) to move the chat to a better position

skribbl.io.chat.js

(function (chatStyle) {
    var sidebar = document.querySelector('#containerSidebar');
    sidebar.style.position = 'absolute';
    sidebar.style.bottom = 0;
    sidebar.style.width = '100%';
    sidebar.style.height = '300px';

    var adsContainer = document.querySelector('#containerFreespace');
    adsContainer.style.display = 'none';
}());