.s3bubble-oembed-preview {
    margin: 0 auto;
    padding-bottom: 56.25%;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.s3bubble-oembed-preview-overlay {
    position: absolute;
    top: 0; 
    left: 0;
    width: 100%; 
    height: 100%;
    background-color: #000
}

.s3bubble-oembed-preview-content {
    color: #fff;
    position: relative;
    top: 50%;
    -webkit-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
}

.s3bubble-oembed-preview h1 {
    margin: 0;
    font-size: 18px;
}

.s3bubble-oembed-preview p {
    margin: 0;
    font-size: 14px;
}