body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-image: url("../img/icon.avif");
    background-size: cover;
    background-attachment: fixed;

}


div.right {
    text-align: right;
}

.over {
    overflow: scroll;
}

.goat_img {
    background-image: url("../img/Colab_Kaike.avif");
    /* background-size: cover; */
    background-attachment: fixed;
}

header {
    background-image: url("../img/icon.avif");
    background-size: cover;
    background-attachment: fixed;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 4px 2px -2px gray;
}

/*サイト内ページの枠を調整*/
nav {
    color: #fff;
    opacity: 0.55;
    background: #978617;
    display: flex;
    justify-content: center;
    padding: 0.5rem 0;
    flex-wrap: wrap;
}

nav a {
    opacity: 1;
    color: #fff;
    margin: 0.5rem;
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: background 0.3s;
}

/*セクションの設定*/
section {
    padding: 2rem;
    margin: 1rem auto;
    max-width: 800px;
    background: rgba(255, 255, 255, 1);
    box-shadow: none;
    border-radius: 8px;

}

/*見出しの設定*/
h2 {
    color: #333;
    border-bottom: 2px solid #4CAF50;
    padding-bottom: 0.5rem;
    display: inline;
    font-size: 100%;
}


/*フッターの設定*/
footer {
    background-image: url("../img/icon.avif");
    background-size: cover;
    background-attachment: fixed;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    position: fixed;
    width: 100%;
    bottom: 0;
    box-shadow: 0 -4px 2px -2px gray;
    margin-top: auto;
}

/*画像の設定*/
img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1rem 0;
}

.image-container {
    display: flex;
}

.image-container img {
    margin-right: 10px;
    /* 画像間のスペースを調整 */
}


summary {
    display: block;
    list-style: none;
    color: #333;

    padding-bottom: 0.5rem;
}

.iframe-box {
    width: 100%;
    height: 0;
    padding-top: 56.25%;
    position: relative;
    overflow: hidden;
}

.iframe-box iframe {
    position: absolute;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
}

div.vid_contents {
    width: 75%;
    /*背景色を横幅いっぱいに広げる*/
    text-align: center;
    margin: auto;
    padding: 4% 4% 4% 4%;
    /*ここで動画の周りの余白を調整*/
    background: rgba(255, 255, 255, 0);
    /*余白の背景色*/
}

div.home_contents {
    width: 100%;
    /*背景色を横幅いっぱいに広げる*/
    text-align: center;
    margin: auto;
    padding: 4% 4% 4% 4%;
    /*ここで動画の周りの余白を調整*/
    background: rgba(0, 0, 0, 0);
    /*余白の背景色*/
}

video.vid_main {
    width: 100%;
    max-width: 700px;
    /*PC版での最大幅*/
}

div.back_goat {
    width: 75%;
    /*背景色を横幅いっぱいに広げる*/
    text-align: center;
    margin: auto;
    padding: 4% 4% 4% 4%;
    /*ここで動画の周りの余白を調整*/
    background: rgba(161, 160, 134, 0.5);
    /*余白の背景色*/
}

table {
    margin-left: auto;
    margin-right: auto;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

td {
    width: 30%;
}