ℇ EULER CONSTANT UTF-8 character with hex code 2107

Using HEX code of EULER CONSTANT in HTML file

<span> &#x2107; </span>

Using Decimal code of EULER CONSTANT in HTML file

<span> &#8455; </span>

Using HEX code of EULER CONSTANT in CSS file for content

span { 
    content: '\2107';
}