.box-outer {
  box-sizing: border-box;
  padding: 10px;
  background-color: #808080;
  border: 10px solid blue;
  margin: 0 auto;
  width: 550px;
}
.box-header {
  box-sizing: border-box;
  padding: 20px;
  background-color: #a142f5;
  border: 5px dashed black;
}
.box-sidebar {
  box-sizing: border-box;
  display: inline-block;
  background-color: #f542b9;
  width: 100px;
}
.box-content {
  box-sizing: border-box;
  display: inline-block;
  background-color: #007fff;
  width: 400px;
}
h2 {
  font-size: 60px;
}