body {
    background-color: white;
    margin: 0;
    font-family: Arial, sans-serif;
}

#my-div {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 1em;
    background-color: #2d2d2d;
    width: 80%;
    max-width: 600px;
    height: 80vh;
    max-height: 600px;
    margin: 0 auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
}

img {
    display: block;
    margin: auto;
    max-width: 90%;
    height: auto;
}

#second-image {
    position: absolute;
    bottom: 0;
    right: 0;
    height: 20vh;
    max-height: 250px;
}

@media only screen and (max-width: 600px) {
    #my-div {
        width: 90%;
        height: 70vh;
    }

    #second-image {
        height: 15vh;
    }
}