@adobe/spectrum-css/dist/components/avatar/index.css

The Spectrum CSS top-level backwards compatible package

.spectrum-Avatar {
  width: 16px;
  height: 16px;

  border-radius: 50%;
  border-style: none;

  -webkit-user-drag: none;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}