Main user block

<marquee><font size="4" color="#278d27"><b><i>Welcome to Central Library OPAC....</marquee>
<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>

<div class="w3-content w3-section" style="max-width:700px">
 

  <img class="mySlides w3-animate-fading" src="library.jpg" style="width:100%">
  <img class="mySlides w3-animate-fading" src="library1.jpg" style="width:100%">
  <img class="mySlides w3-animate-fading" src="library3.jpg" style="width:100%">
  <img class="mySlides w3-animate-fading" src="library4.jpg" style="width:100%">
<img class="mySlides w3-animate-fading" src="library5.jpg" style="width:100%">
<img class="mySlides w3-animate-fading" src="library6.jpg" style="width:100%">
<img class="mySlides w3-animate-fading" src="library7.jpg" style="width:100%">
<img class="mySlides w3-animate-fading" src="library2.jpg" style="width:100%">
</div>

<script>
var myIndex = 0;
carousel();

function carousel() {
  var i;
  var x = document.getElementsByClassName("mySlides");
  for (i = 0; i < x.length; i++) {
    x[i].style.display = "none";
  }
  myIndex++;
  if (myIndex > x.length) {myIndex = 1}  
  x[myIndex-1].style.display = "block";
  setTimeout(carousel, 9000);  
}
</script>

</body>
</html>