HTML Code IFRAME Too Small

Need assistance again with html code iframe too small.  I previously used forum and received code below which help solve when page was HOME page:

div#block-yui_3_17_2_1_1572567603013_10718 iframe { height: 600px; }

Need help with following:

First I I duplicated the HOME page and renamed it FEATURED LISTINGS and moved it to not link tab.  Then I created button on footer and linked the FEATURED LISTINGS page.  When I changed the code for featured listing, the frame is once again too small.

https://www.guardianrealestate254.com

Password to view site is:      help

To insert the iframe, you are adding some HTML in a Code Block. You should be specifying the size in this code, for example 'height=600px'. You shouldn't need additional CSS (like you have shown above) to set the iframe size later. 

Paul,

I tried with inserting code into code block but it had to be inserted via css which I gather is the code needed similar to div#block-yui_3_17_2_1_1572567603013_10718 iframe { height: 600px; }

Paul,

It worked this time and thank you so much....