.field--name-field-video.field__item {
    .field--name-field-media-oembed-video {
        max-width: 950px;
        margin: 80px auto;
        width: 80%;

        iframe {
            width: 100%;
            height: 630px;
        }
    }
}

@media (max-width: 992px) {
    .field--name-field-video.field__item {
        .field--name-field-media-oembed-video {
            width: 92%;
    
            iframe {
                height: auto;
                min-height: 400px;
            }
        }
    }
}

@media (max-width: 576px) {
    .field--name-field-video.field__item {
        .field--name-field-media-oembed-video {
    
            iframe {
                height: auto;
                min-height: 300px;
            }
        }
    }
}