bitwarden-estensione-browser/apps/web/src/connectors/duo.scss

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: #efeff4 url("../images/loading.svg") 0 0 no-repeat;
}

iframe {
  display: block;
  width: 100%;
  height: 400px;
  border: none;
  margin: 0;
  padding: 0;
}