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HTML

              
                <app>
  <nav>Hello GridLock</nav>
  <main>
    <section class="ads left">
      <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Iste, laborum. Quo accusamus, impedit culpa, repellat ea, expedita atque dolor nam est neque cupiditate tenetur harum unde. Repellendus a voluptas iste!</p>
      <p>Est veniam ducimus repudiandae distinctio! Ducimus labore, officiis quibusdam atque ab incidunt nesciunt sequi, itaque odit iure placeat nulla veritatis. Quas veniam quibusdam modi veritatis explicabo excepturi sed eos alias.</p>
      <p>Repellat harum delectus nisi. Aliquid dignissimos voluptatum voluptate, eius asperiores libero deleniti vero officia et. Quaerat, molestias facilis! Nihil, sit. Consequatur iure doloribus repudiandae nesciunt. Provident odio aspernatur illo nulla.</p>
      <p>Qui dignissimos quis velit a quod cum eius deleniti voluptate, aspernatur temporibus libero deserunt quia officia exercitationem cumque. Incidunt delectus accusantium numquam aut culpa distinctio maiores odio quis assumenda facere.</p>
    </section>
    <section class="content">
<!--have to have an inner-wrapper 
    in order to force the inner content 
    to scroll vertically - 
    even though content should only be 1fr
-->
      <div class="container">
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. A eveniet enim deserunt dolor quam tenetur, consequatur repellendus vero excepturi. Inventore laborum possimus porro qui laudantium debitis praesentium corrupti iure molestiae.</p>
        <p>Vitae ipsa quae aspernatur, voluptate aperiam dignissimos explicabo provident. Ducimus aliquam, sunt sequi laudantium vel delectus velit labore nemo tenetur minus, nulla amet inventore eius vero ipsam. Facilis, hic esse?</p>
        <p>Ullam sed dolorem quo minus, cupiditate modi porro dolore? Quaerat dolorum mollitia at maiores, velit neque explicabo consequuntur doloribus ullam, tempore libero commodi, voluptas ea architecto tempora deleniti quis ex?</p>
        <p>Nam, voluptatem sit nemo odio omnis at rem soluta, dolor, ipsa aut eligendi! Numquam soluta excepturi, sequi, voluptatibus, voluptate laudantium quaerat deleniti assumenda libero consequatur ipsum. Fuga sequi dignissimos sapiente.</p>
        <p>Nesciunt harum voluptatibus iusto laborum sit illum. Vero id, illo sequi maxime reiciendis amet placeat fuga voluptatum distinctio qui perspiciatis nobis cumque dolore impedit, ullam quo fugit, doloremque iste quos!</p>
      </div>
    </section>
  </main>
  <footer>
    About | Contact | Etc...
  </footer>
</app>
              
            
!

CSS

              
                html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

app {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  
  nav, footer {
    background-color: cornflowerblue;
    padding: 5px 10px;
  }
  
  main {
    background-color: white;
    padding: 10px;
    display: grid;
    grid-template-columns: 175px 1fr;
    grid-column-gap: 10px;
    //Even though we have overflow-y on the .ads and .content,
    //still have to have it here to keep
    //content from growing outside the grid row definition
    overflow-y: auto;
    
    .ads, .content {
      background-color: silver;
      overflow-y: auto;
      padding: 10px;
      
      p {
        margin: 0;
        + p {
          margin-top: 15px;
        }
      }
    }
    
    .content .container {
      height: 1200px;
    }
  }
}
              
            
!

JS

              
                
              
            
!
999px

Console