Some text

<div id="w">
  <div id="a">
  Title a<br>
  <button>a 1</button>
  </div>
  <div id="b">
  Title b<br>
  <button>b 1</button>
  </div>
</div>

<style>
#a {
  background-color: red;
  height: 40px;
}
#b {
  background-color: blue;
}

#w {
  background-color: green;
  border: solid 1px;
  padding: 5px;
}
</style>