---

String htmlPage() {
  String page = "<html><body>";
  page += "<p><a href='/on'><button style='padding:20px; font-size:18px;'>ВКЛ</button></a></p>";
  page += "<p><a href='/off'><button style='padding:20px; font-size:18px;'>ВЫКЛ</button></a></p>";
  page += "</body></html>";
  return page;
}

void handleRoot() {
  server.send(200, "text/html", htmlPage());
}

void handleOn() {
  digitalWrite(ledPin, HIGH);
  server.send(200, "text/html", htmlPage() + "<p>LED включен</p>");
}

void handleOff() {
  digitalWrite(ledPin, LOW);
  server.send(200, "text/html", htmlPage() + "<p>LED выключен</p>");
}