You can accomplish this by customizing the in-game CSS with the help of a third-party browser extension (e.g. Stylish): @-moz-document url-prefix("<a href="https://app.roll20.net/editor/" rel="nofollow">https://app.roll20.net/editor/</a>"), url-prefix("<a href="https://app.roll20dev.net/editor/" rel="nofollow">https://app.roll20dev.net/editor/</a>") {
.handoutviewer .avatar {
margin: auto;
width: 20%;
}
} After installing Stylish for Firefox or Chrome , save the code above as a New Style.