Hello and sorry for the duplicate, but I hadn’t seen the answer… in the end I contacted my webmaster and solved it like this, at least I can be useful for others.
< div class=“twitch-container”>
<iframe class="twitch-responsive-iframe"src=“Twitch” frameborder=“0” allowfullscreen=“true” scrolling=“no”>
In the channel section replace example with the name of your channel and in the second example insert your website where the player will be embedded