ookla Speedtest with i frame

Hi<iframe width="100%" height="650px" frameborder="0" src="https://yanivsu.speedtestcustom.com/"></iframe>

fro some reason only i see is white page and when i try to get it to the website I can see the Speedtest perfect https://yanivsu.speedtestcustom.com. In addition when i put in the src a regular website its work perfect on my website... please help me...