.background {
    background-color: black;
}

h1, p {
    color: white;
    text-align: center;
    font-size: 30px;
}

.guestbook {
    display: flex;
    align-items: center;
    justify-content: center;
}

.guestbook div {
    display: flex;
}

iframe {
    width: 75%;
    height: 750px;
}

img {
    margin: auto;
    display: flex;
}