body {
    background-color: black;
    color: white;
}

html, body {
    margin: 0;
    height: 100%;
}

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.image-responsive {
    height: 250px;
}

@media only screen and (max-width: 600px) {
    .image-responsive {
        height: 95px;
    }
}