🔲 Black square button UTF-8 character with hex code 1F532

Using HEX code of Black square button in HTML file

<span> &#x1F532; </span>

Using Decimal code of Black square button in HTML file

<span> &#128306; </span>

Using HEX code of Black square button in CSS file for content

span { 
    content: '\1f532';
}