Live365 Radio Station Embed is Perfect on Desktop but too Wide on Mobile

Live365 Radio Station Embed is Perfect on Desktop but too Wide on Mobile. How can I fix this? Here is my embed code: 

<iframe width=800" height="296" frameborder="0" src="https://live365.com/embeds/v1/player/a13022?s=xl&m=light&c=mp3"></iframe>

You can use this to Website Tools > Custom CSS

@media screen and (max-width:767px) {
	iframe[src*="live365"] {
		width: 100% !important;
}
}