body {
  margin: 0;
  padding: 0;
}
.container {
    display: grid;
    grid-template-columns: repeat(12,1fr);
    grid-template-rows: 5vh 90vh 5vh;
}

header {
  background-color: darkgrey;
  grid-column: 1/-1;

}

aside {

  grid-column: 1/5;
  background-color: rgb(116, 70, 136);
}

main {

  grid-column: 5/-1;
  background-color: maroon;
}

footer {
  grid-column: 1/-1;
  background-color: rgb(60, 60, 218);
}