* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html,
  body {
    height: 100%;
  }
  
  body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
  }
  
  main {
    flex: 1 0 auto;
  }

  main-grid{
    float: left;
    width: 30%;
  }

  main-content{
    float: left;
    width: 70%;
  }