<style>
body {
    height: 2000px;
}

div {
  width: 300px;
  height: 300px;
  background-color: green;
}

.container {
  position: relative;
  overflow: hidden;
  z-index: 0;
}

.fixed {
  position: fixed;
  left: 150px;
  top: 150px;
  background-color: red;
}
.absolute {
  position: absolute;
  left: 200px;
  top: 100px;
  background-color: blue;
}
</style>

<div class=container><div class=fixed></div><div class=absolute></div></div>