* * {
  padding: 0px;
  margin: 0px;
}

.container {
  position: relative;
  min-height: 350px;
}

.block-position-static {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: yellow;
  text-align: center;
}

.block-position-relative {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: blue;
  color: white;
  text-align: center;
  top: 35px;
  left: 55px;
  opacity: 0.75;
  position: relative;
}

.block-position-absolute {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: blue;
  color: white;
  text-align: center;
  top: 35px;
  left: 55px;
  opacity: 0.75;
  position: absolute;
}

.block-position-fixed {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: orange;
  color: black;
  text-align: center;
  top: 200px;
  right: 55px;
  opacity: 0.75;
  position: fixed;
}

.block-position-sticky {
  width: 150px;
  height: 150px;
  margin-left: 500px;
  border: 1px solid black;
  background-color: cyan;
  color: black;
  text-align: center;
  top: 75px;
  opacity: 0.75;
  position: sticky;
}

dl {
  width: 200px;
  height: 200px;
  margin-left: 75px;
  border: 1px solid black;
  background-color: cyan;
  color: black;
  text-align: center;
  opacity: 0.75;
  overflow: auto;
}

dt {
  font-weight: bold;
  background-color: gray;
  position: sticky;
  top: 0px;
}

dd {
  color: gray;
}

.block-position-absolute-without-z-index-blue {
  width: 150px;
  height: 250px;
  border: 1px solid black;
  background-color: blue;
  color: white;
  text-align: center;
  top: 35px;
  left: 45px;
  position: absolute;
}

.block-position-absolute-without-z-index-yellow {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: yellow;
  text-align: center;
  top: 125px;
  left: 100px;
  position: absolute;
}

.block-position-absolute-without-z-index-green {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: green;
  text-align: center;
  top: 175px;
  left: 70px;
  position: absolute;
}

.block-position-absolute-z-index-1 {
  width: 150px;
  height: 250px;
  border: 1px solid black;
  background-color: blue;
  color: white;
  text-align: center;
  top: 35px;
  left: 45px;
  position: absolute;
  z-index: 1;
}

.block-position-absolute-z-index-2 {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: yellow;
  text-align: center;
  top: 125px;
  left: 100px;
  position: absolute;
  z-index: 2;
}

.block-position-absolute-z-index-3 {
  width: 150px;
  height: 150px;
  border: 1px solid black;
  background-color: green;
  text-align: center;
  top: 175px;
  left: 70px;
  position: absolute;
  z-index: 3;
}