body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #000000;
}

.centered-div {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 90%;
    max-width: 600px;
}

.centered-div img {
    max-width: 100%;
    height: auto;
}