.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.link-accessible {
  color: #004080;               /* colore con contrasto sufficiente */
  text-decoration: underline;   /* non solo colore */
}
.link-accessible:focus,
.link-accessible:focus-visible {
  outline: 3px solid #ff0000;
  outline-offset: 2px;
}