JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <span id="betalfakturavalg">
        <input type="radio" name="betalfakturavalg" title="Valg Faktura" 
        onclick="document.getElementById('betalfakturavalg').style.cssText='border-color:#85c222; background-color:#E5F7C7;';" /> Faktura - For bedrifter  
    </span>
    <br>
    <span id="betalkortvalg">
        <input type="radio" name="kreditkort" title="Valg Kreditkort" 
        onclick="document.getElementById('betalkortvalg').style.cssText='border-color:#85c222; background-color:#E5F7C7;';" /> Kreditkort - For alle privatpersoner
    </span>
</form>