Full-width Discord Activity in Popout by solarswordsman

/* ==UserStyle==
@name           Full-width Discord Activity in Popout
@namespace      github.com/openstyles/stylus
@version        1.0.0
@description    This simple style expands the width of the iframe used for Discord Activities, when the Activity is popped out.
@author         solarswordsman
==/UserStyle== */

@-moz-document url-prefix("https://discord.com/popout") {
    div[class*="pictureInPictureWindow__"] {
        width: 100%;
    }
    div[class*="pictureInPicture__"] {
        width: 100%;
    }
    div[class*="pictureInPictureWindow__"] > div {
        width: 100% !important;
    }
}