.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .overlay .loader {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        border: 4px solid #fff;
        border-top-color: #aaa;
        animation: spin 1s infinite linear;
    }

#materialVerwaltung,
#materialOverlayContainer,
#lagerortModalBodyContainer,
#bilderverwaltungOverlayContainer,
#stoerstelleOverlayContainer {
    position: relative;
}

    #materialVerwaltung .overlay,
    #materialOverlayContainer .overlay,
    #lagerortModalBodyContainer .overlay,
    #bilderverwaltungOverlayContainer .overlay,
    #stoerstelleOverlayContainer .overlay {
        display: none;
        border-radius: 4px;
        margin: 0;
        padding: 0;
    }

    #materialVerwaltung.loading .overlay,
    #materialOverlayContainer.loadingModal .overlay,
    #lagerortModalBodyContainer.loadingModal .overlay,
    #bilderverwaltungOverlayContainer.loading .overlay,
    #stoerstelleOverlayContainer.loading .overlay {
        display: flex;
    }

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0);
    }

    to {
        transform: rotate(360deg);
    }
}