▨ SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL UTF-8 character with hex code 25A8

Using HEX code of SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL in HTML file

<span> &#x25A8; </span>

Using Decimal code of SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL in HTML file

<span> &#9640; </span>

Using HEX code of SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL in CSS file for content

span { 
    content: '\25a8';
}