html, body {
    margin: 0;
    padding: 0;
    font-size: 100%;
    height: 100%;
}
.wrapper {
    height: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
}

img {
    display: block;
    width: 30%;
}

@media (max-width: 768px) {

    img {
        width: 60%;
    }
}