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I need to make a div float inside another div and move on scrolling, but I need the floating div to not pop out of a container div

I need the floating div to stay inside the container div

Any idea how to do this?

body {
  height: 800px;
}

#main-container {
  width: 100px;
  height: 300px;
  background-color: black;
  margin-top: 100px;
}

#secondary-container {
  width: 90px;
  height: 30px;
  background-color: red;
  position: fixed;
}
<body>
  <div id="main-container">
    <div id="secondary-container"></div>
  </div>
</body>

0 Answers0