If you had the problem to create an iframe with only vertical scrolling and you don't know hot to make it read the following lines.
to have only vertical scrolling you must insert into the tag <iframe> this code:
style="overflow-x: hidden;"
So, if for example you want to create an iframe with a width of 200px and with only vertcal scrolling, you must write:
<iframe width="200" style="overflow-x: hidden;">