.security-captcha .captcha-box {
  max-width: 220px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #dee2e6;
  background: #f8f9fa;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.security-captcha .captcha-image {
  display: block;
  width: 100%;
  height: auto;
}

.security-captcha .captcha-refresh-btn {
  position: absolute;
  bottom: 6px;
  right: 6px;
  padding: 2px 6px;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
  font-size: 0.8rem;
}

.security-captcha .captcha-refresh-btn:hover {
  background-color: #e9ecef;
}