body{
  min-height: 100vh;
  line-height: 1.8;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: mintcream;
}

header{
  min-height:50px;
  background:lightcyan;
}

footer{
  text-align:center;
  padding:10px;
  min-height:50px;
  background:AliceBlue;
}