Embedding and Removing Play Button on Videos

Site URL: https://www.alanvidali.com/videos

Hi everyone! 

I wanted to change a few things from the videos with a custom htlm/css code. I want to remove the play button arrow from the videos and I want to make these have autoplay and loop. 

I also have the specific html embed codes but I have no idea how to place these inside the HTML code.

Here is the page I am talking about https://www.alanvidali.com/videos

I am hosting my videos with Streamable.

The embed code from the video hosting site is the following:

<div style="width:100%;height:0px;position:relative;padding-bottom:56.250%;"><iframe src="https://streamable.com/e/gpqiln" frameborder="0" width="100%" height="100%" allowfullscreen style="width:100%;height:100%;position:absolute;left:0px;top:0px;overflow:hidden;"></iframe></div>

I have no idea where to place and how to place this in the CSS/HTML custom code editor.

Thanks again for taking a look and I appreciate the support!