[K4] 4.0 Compatibility

[afbora]

UI broken for K4

Kirby 4.0.0-rc.4 PHP 8.1.23

[hv-pul]

Thanks for reporting! Not sure yet when I'll find the time but this will be fixed.

[matthacksteiner]

Suggested fix:

.pju-webhook--btn {
    display: flex;
    color: #fff;
    background: #2d2f36;
    padding: 1.75em 1.5em 1.875em;
    border-radius: 6px;
    }