#container {
    width: 100%;
    max-width: 1000px;
    margin:0 auto;
    display: flex;
    flex-wrap: wrap;
  }

#thumbnails img {
    flex-grow: 1;
    object-fit: cover;
    height: 200px;
    max-width: 400px;
    margin: 0.2rem;
    border-radius: 4px;
}

  /* 追加部分 */
#modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.9);
}

#modal-content {
    position: relative;
    margin: 40px auto;
    padding: 20px;
    max-width: 800px;
    text-align: center;
}

#modal-img {
    width: 100%;
    height: auto;
    max-height: 70vh;
    margin-top: 24px;
}

#modal-caption, #modal-date {
    margin-top: 20px;
    color: white;
}

.close {
    color: white;
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}