:root { --animation-mainstage-id: 'zoom-in'; }

/* mainstages zoom-in */
@keyframes anim-zoom-in {
    0% {
        opacity: 0;
        transform: scale(.75)
    }

    to {
        opacity: 1;
        transform: scale(1)
    }
}

.mstg [class*="mn_"] {
    animation: anim-zoom-in 0.5s ease-out both;
}