#spinner { /*Spinner-Styling */
    display: none;   /* none !!! */
    width: 10vmin;
    height: 10vmin;
    border: 1.2vmin solid rgba(0,0,0,0.15);
    border-top: 1.2vmin solid #3498db;
    border-radius: 50%;
    position: absolute; /* Relativ zum fixen Elternelement */
    top: 20%; /* 50% von oben */
    left: 40%; /* 50% von links */
    transform: translate(-50%, -50%); /* Korrigiert die Verschiebung um die Hälfte der eigenen Größe */

    animation: spin 0.8s linear infinite,
               fade 0.8s ease-in-out infinite;
}

/* Ultra-smooth Rotation */
@keyframes spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

/* Soft Pulse */
@keyframes fade {
    0%   { opacity: 0.5; }
    50%  { opacity: 1; }
    100% { opacity: 0.5; }
}