@media screen and (max-width: 683px) {
    main {
        width: 90%;
    }
    h1 {
        font-size: 11vw;
    }
    iframe {
        width: 100%;
        margin-top: 10vh;
    }
    img {
        position: absolute;
        bottom: 1vw;
        width: 80%;
        left: 50%;
        transform: translateX(-50%) translateY(-50%);
    }
}