ElementById('textarea');
            const toolbarEle = document.getElementById('toolbar');
        
            const overlayEle = document.createElement('div');
            overlayEle.classList.add('container__overlay');
            containerEle.prepend(overlayEle);
        
            overlayEle.appendChild(toolbarEle);
        
            const mirroredEle = document.createElement('div');
            mirroredEle.textContent = textarea.value;
            mirroredEle.classList.add('container__mirror');
