How to add icon 'x' or turn off icon facebook message

[nqam1904]

Hi everybody! I had an issue with message facebook SDK, i want to add icon 'x' css style message facebook to delete element facebook message.

const closeFacebook = () => {
        const box: any = document.getElementById('fb-root');
        box.style.display = 'none';
    };
<span className="close-icon" onClick={closeFacebook}> &#10005 </span>
<div id="fb-root" />
<div id="fb-customer-chat" className="fb-customerchat" />

I wonder if anyone has ever had a similar issue and managed to solve it like I did. I need some guidance for the solution. Thank you very much.