body {
    background-color: #000;
    margin: 0;
    padding: 0;
}

.img-wrapper {
    height: 90vh;
    width: 100vw;
    padding: 0;
}

.main-img {
    padding: 0;
    position: absolute;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    max-width: 100%;
    max-height: 100%;
}