.mat-tab-body {
    animation: fade-out 0.5s;
    opacity: 0;
}
.mat-tab-body.mat-tab-body-active {
    animation: fade-in 0.5s;
    opacity: 1;
}

@keyframes fade-in {
    0% {
        opacity: 0;
    }
    50% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fade-out {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0;
    }
    100% {
        opacity: 0;
    }
}