== Your web page ==
*Download the iframeResizer.contentWindow.min.js file from the developer site or from https://beds24.com/include/iframeresizer/3.5.3/iframeResizer.min.js
*Remove any height parameter from your iframe and add the script after the iframe, if necessary change the src path to the location of your iframeResizer.min.js file. If you prefer, you can set a fixed iframe width in pixels rather than a percentage.
*Upload the file to your web space
Refer to the developers web site for a full set of options, instructions and problem solving.
Make sure to use the same version number as the iframeResizer.contentWindow.min.js which has been included on the booking page. (in this example 3.5.3 )