How to make an iframe responses

Do you ever struggle to make your iframes look good and be responsive?

I strongly recomend you look at the explanation to this code on the authors site:

Authors full code example

Just apply the above css to a div that wraps your iframe

        .iframeContainer {
            overflow: hidden;
            padding-top: 56.25%;
            position: relative;
            border: 1.2px solid red;
            background-color: red;
        }

        .iframeContainer iframe {
            height: 100%;
            left: 0;
            position: absolute;
            top: 0;
            width: 100%;
            border: 0;
        }