.loading-indicator {
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 99999;
    display: none;
    justify-content: center;
    align-items: center;
    position: absolute;   
}

turbo-frame[loading] {
    .loading-indicator {
        display: flex;
    }
    opacity: 0.5;   
}