ǃ LATIN LETTER RETROFLEX CLICK UTF-8 character with hex code 01C3

Using HEX code of LATIN LETTER RETROFLEX CLICK in HTML file

<span> &#x01C3; </span>

Using Decimal code of LATIN LETTER RETROFLEX CLICK in HTML file

<span> &#451; </span>

Using HEX code of LATIN LETTER RETROFLEX CLICK in CSS file for content

span { 
    content: '\01c3';
}