.box-layers {
    background-color: #eeeeee;
    padding: 2rem 1rem 4rem 1rem;
    border-top: 10px solid #dddddd;
    margin: 4rem 0;
}

.h2-wrapper {
    border: 1px solid black;
}

.box-sizing-example {
    background-color: #eeeeee;
    padding: 2rem;
    border: 10px solid #dddddd;
    width: 100%;
    box-sizing: border-box; /*specifies that width is measured border box, not content box*/
  }

  .overflow-example {
      width: 50%;
      height: 300px;
      overflow: auto; /*try to avoid this scrolling*/
  }