.avatar-frame {
    width: 350px;          /* change this to the size you want */
    aspect-ratio: 1 / 1;   /* guarantees a square, even before image loads */
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 1rem;
  }
  
  /* fill the frame without distortion and beat any theme rules */
  .avatar-frame > .author-avatar {
    display: block;
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
    object-position: center;
    max-width: none !important;
    transform: none !important;  /* in case the theme scales images */
  }
  
  /* optional: if the theme has a generic img { width:100%; } inside .author */
  .author img { width: auto !important; height: auto !important; }