vaultwarden/web-vault/app/views/premiumRequired.html

<div class="modal-header">
    <button type="button" class="close" ng-click="close()" aria-label="Close"><span aria-hidden="true">&times;</span></button>
    <h4 class="modal-title"><i class="fa fa-star"></i> Premium <span class="hidden-xs">Membership</span> Required</h4>
</div>
<div class="modal-body">
    <p>This features requires a premium membership. Sign up for premium and get:</p>
    <ul class="fa-ul">
        <li>
            <i class="fa-li fa fa-check text-green"></i>
            1 GB of encrypted file storage.
        </li>
        <li>
            <i class="fa-li fa fa-check text-green"></i>
            Additional two-step login options such as YubiKey, FIDO U2F, and Duo.
        </li>
        <li>
            <i class="fa-li fa fa-check text-green"></i>
            TOTP verification code (2FA) generator for logins in your vault.
        </li>
        <li>
            <i class="fa-li fa fa-check text-green"></i>
            Priority customer support.
        </li>
        <li>
            <i class="fa-li fa fa-check text-green"></i>
            All future premium features. More coming soon!
        </li>
    </ul>
    All for just <b>{{10 | currency:"$":0}}</b> /year.
</div>
<div class="modal-footer">
    <button type="submit" class="btn btn-primary btn-flat" ng-click="go()">
        Get Premium
    </button>
    <button type="button" class="btn btn-default btn-flat" ng-click="close()">Close</button>
</div>