how to make no scroll in html code example

Example 1: disable scroll css

/* Answer to: "disable scroll css" */

/*
  You must set the height and overflow of the body, to disable
  scrolling.
*/

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden
}

Example 2: css no scroll

<!DOCTYPE html>
<html>
<head>
<style>
body {
  height: 5000px; /* Make this site really long */
  width: 5000px; /* Make this site really wide */
  overflow: hidden; /* Hide scrollbars */
}
</style>
</head>
<body>

<h2>Hide scrollbars</h2>
<p>This example will hide the scrollbars (and the functionality - it is not possible to scroll inside the page).</p>
<p>Try to remove <strong>overflow: hidden;</strong> to see the effect.</p>

</body>
</html>

Example 3: javascript keep scroll visible

::-webkit-scrollbar {
  -webkit-appearance: none;
  width: 7px;
}
::-webkit-scrollbar-thumb {
  border-radius: 4px;
  background-color: rgba(0, 0, 0, .5);
  -webkit-box-shadow: 0 0 1px rgba(255, 255, 255, .5);
}