Flex box con overflow

[patent verge]

<div class="container">
  <aside>
    <div class="content-1">
      home<br>
      home<br>
      home<br>
    </div>
    <div class="content-2">
    >>>Agrega mucho contenido aqui<<<
    </div>
  </aside>
  <main>
    Main
  </main>
</div>

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

.container {
    width: 100%;
    height: 100vh;
    background-color: red;
    display: flex;
    padding: 1rem;
}

aside {
    width: 300px;
    display: flex;
    flex-direction: column;
}

aside .content-1 {
    background-color: blue;
    color: white;
}

aside .content-2 {
    height: 100%;
    background-color: yellow;
    overflow-y: auto;
}

main {
    background-color: green;
    flex-grow: 1;
}