Quelltext der Seite Widget:GoogleKalender

<!-- Quelle: https://www.w3schools.com/howto/howto_css_responsive_iframes.asp -->
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.container {
  position: relative;
  width: 100%;
  overflow: hidden;
  padding-top: 50%; /* 4:3 Aspect Ratio */
}

.responsive-iframe {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  border: none;
}
</style>
</head>
<body>

<div class="container"> 
  <iframe class="responsive-iframe"	src="https://calendar.google.com/calendar/embed?height=600&wkst=2&bgcolor=%23ffffff&ctz=Europe%2FBerlin&showNav=1&showCalendars=0&showTz=1&showTitle=0&showDate=1&showTabs=1&src=c2Jyd2h2QGdtYWlsLmNvbQ&src=N2RhNWFhZWQ3NDkwOWI1MWI3NTBiNTFkNGI4NzkxZWEwMDJhNDU3NWY1ZGZjYmQxZDA5MDczYjExM2ZmZjZkOEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t&src=MTJkMjJmY2Y3MWM4OThkN2QwMTA1YzE1NTBhZTJkY2ZkNzM0ZDVmNzc1Yjk1NGY0ZTRhY2NjYjY1ZTM0MjRmM0Bncm91cC5jYWxlbmRhci5nb29nbGUuY29t&src=ZGUuZ2VybWFuI2hvbGlkYXlAZ3JvdXAudi5jYWxlbmRhci5nb29nbGUuY29t&color=%23039BE5&color=%23D50000&color=%23616161&color=%230B8043">
  </iframe>
</div>

</body>
</html>