➊ DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE UTF-8 character with hex code 278A

Using HEX code of DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE in HTML file

<span> &#x278A; </span>

Using Decimal code of DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE in HTML file

<span> &#10122; </span>

Using HEX code of DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE in CSS file for content

span { 
    content: '\278a';
}