도body {
    font-family: sans-serif;
    background-color: #f0f0f0;
    color: #333;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.swiper {
    width: 80%;
    max-width: 800px;
    height: 450px;
}

.swiper-slide {
    text-align: center;
    font-size: 18px;
    background: #fff;

    /* Center slide text vertically */
    display: flex;
    justify-content: center;
    align-items: center;
}

.swiper-slide img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.swiper-slide-youtube {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
}

.swiper-slide-youtube iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

:root {
    --swiper-navigation-color: #ffffff;
    --swiper-pagination-color: #ffffff;
}

.swiper-button-prev, .swiper-button-next {
    background-color: rgba(0,0,0,0.5);
    padding: 20px;
    border-radius: 50%;
}