body {
    font-family: Arial, sans-serif;
}
.gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.gallery-item {
    width: calc(33.333% - 20px);
    margin-bottom: 20px;
}
.gallery-item iframe {
    width: 100%;
    height: 200px;
}