Box-model

HTML

<div>
  <p>Mão na massa</p>
</div>

CSS

p {
  background-color: blue;
  color: white;
  width: 200px;
  padding: 20px;
  border: 50px red solid;
  margin: 30px;
  box-sizing: border-box;
}

div {
  display: inline-block;
  margin: 0;
  padding: 0;
  background-color: green;
}