style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  font-size: 1.5rem;
  min-height: 200vh;
}

.outer-container {
  border: 3px dashed black;
  width: 75vw;
  height: 85vh;
  margin: 40px auto;
  position: relative;
}

.inner-container {
  border: 2px solid blue;
  width: 40vw;
  height: 50vh;
  margin: 200px auto;
/*position: relative;*/
}

.box {
  width: 150px;
  height: 150px;
  color: white;
  padding: 1rem;
}

.absolute {
  background-color: blue;
  position: absolute;
/*top: 100px;*/
/*left: 100px;*/
  top: 0;
  left: 0;
  z-index: 1; /* per cambiare la posizione dei blocchi */
}

.relative {
  background-color: red;
  position: relative;
  top: 300px;
  left: 100px;
}

.fixed {
  background-color: green;
  position: fixed;
  top: 100px;
}

.sticky {
  background-color: pink;
  position: sticky;
  top: 0;
}