html, body {

  height: 100%;

}

​

body {

  margin: 0;

  min-height: 100%;

}

​

.navigation {

  background-color: lightyellow;

  width:100%;

  height:20%;

  position:fixed;

}

​

.slider {

  position: absolute;

  top:20%;

  height:60%;

  width:100%;

  background-color: lightgreen;

}

​

.footer {

  position: relative;

  top: 80%;

  background-color: lightblue;

  height: 20%;

  width: 100%;

}