.w-Custom div.header-widget {
    margin-bottom: 0 !important;
}

.custom-content {
    height: calc(100% - 30px); /* should have a title with ~50px */
    overflow-y: auto;
    overflow-x: hidden;
    width:100%;
}

.custom-content:only-child {
    height:100%;
}

.custom-content > div[data-oembed-url] {
    overflow-y: auto;
    height: 100%;
}