⊐ SQUARE ORIGINAL OF UTF-8 character with hex code 2290

Using HEX code of SQUARE ORIGINAL OF in HTML file

<span> &#x2290; </span>

Using Decimal code of SQUARE ORIGINAL OF in HTML file

<span> &#8848; </span>

Using HEX code of SQUARE ORIGINAL OF in CSS file for content

span { 
    content: '\2290';
}