Change CSS in the embed preview

Hi everyone, look, I want to change the window size for an embed link, I’m using the plugin “Simple Embeds” ant he embed code is:

title: "Cold Blue - Poseidon"
image: "https://i.discogs.com/ct8-lwdJC0OGsqcFzkI_2IH7pwAomZ28fcY0o_FCwYk/rs:fit/g:sm/q:90/h:600/w:600/czM6Ly9kaXNjb2dz/LWRhdGFiYXNlLWlt/YWdlcy9SLTgxNTM4/NTUtMTQ1NjgzODc2/NC04MTM5LmpwZWc.jpeg"
description: "Tobias Schuh aka Cold Blue - Productor de trance de Mainz, Alemania.."
url: "https://www.discogs.com/es/master/962238-Cold-Blue-Poseidon"

I show the code in html and saw the .w class, I change this class and the inside content change bit the window doesn’t, how can I change the window size?. This is the preview and the CSS.

CSS

.w  {
    margin: 6px;
    width: 60%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    background-color: dimgray;
}

THANKS!

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