<aside>
  Sidebar Section
</aside>

<main>
  Main Section
</main>

@import url("https://fonts.googleapis.com/css?family=Gochi+Hand");

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


body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  background-color: #291642;
  font-family: "Gochi Hand", sans-serif;
  font-size: 130%;
  letter-spacing: 0.1rem;
  color: #fff;
  display: grid;
  grid-template-columns: max(30vw, 220px) 1fr;
  column-gap: max(4vw, 20px);
}

aside {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #2196F3;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #3F51B5;
}