#ust-uploader { border:1px solid #ccc; padding:15px; margin:15px 0; }
#ust_result p { margin:4px 0; }

  /* Thumbnail-sized preview */
.ust-preview-box {
    border: 1px dashed #ddd;
    padding: 6px;
    width: 140px;           /* hard cap the box */
    background: #fafafa;
  }
  .ust-preview-box img {
    display: block;
    width: 100%;            /* fit into the small box */
    height: auto;
    max-height: 120px;      /* extra guard */
    object-fit: contain;
  }