Video on Slide show not adjusting in cell phone

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Hi guys,

I have added a video to a costumer store instead of a pic on the slide show. On theme.liquid I added the code below. The video is playing  good but:

1. How to make it automatically adjust to cell phone and to desktop?

2. what is the best size of video to it apear as wildscreen?

The store link is

<section class="video-slider-area-center>
<div class "video-slider">
<video <iframe width="985px" height="540px" src="" autoplay muted loop playinline adapt to first image></video>