iframe {
    width: 100%;
    max-width: 560px;
    height: 315px;
    border: none;
}

.redpin-youtube-embed-container {
    position: relative;
    padding-bottom: 56.25%; /* Proporcja 16:9 */
    height: 0;
    overflow: hidden;
    max-width: 100%;
}

.redpin-youtube-embed-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}