body {margin: 0;}
.container {
    
}

.mv {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 90%;
    margin: 0 auto;
    height: max(100dvh, 700px);
}

.mv img {
    width: 100%;
    height: 100%;
}

@media screen and (max-width: 640px) {
    .container {
        
    }
    .mv {
        height: max(100dvh, 480px);
}
}