.section_home {
    padding: 10px 20px;
    background-color: #DDDDDD;
}

.divide_image_text {
    display: flex;
}

h3 {
    text-align: center;
    font-size: 24px;
}

a {
    text-decoration: none;
    color: #551A8B;
}

.div_video {
    display: flex;
    justify-content: space-between;
}

.div_video div {
    max-width: 35%;
}

.base_div {
    margin-bottom: 55px;
}

.advertising {
    background-color: #F7E5AF;
    padding: 5px 30px;
}

.description {
    font-size: 18px;
}

@media only screen and (max-width: 900px) {
    .section_home {
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    .base_div {
        display: flex;
        flex-direction: column;
    }

    body main .divide_image_text {
        display: flex;
        flex-direction: column;
    }

    iframe {
        width: 100%;
    }

    img {
        width: 100%;
    }

    .div_video div {
        max-width: 100%;
    }
}