@import url('https://fonts.googleapis.com/css?family=Nunito+Sans&display=swap');
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Nunito Sans', sans-serif;
  margin: auto;
  max-width: 900px;
  padding: 0.5em 2em;
  border: 1px dotted grey;
  border-radius: 10px;
}
div {
  font-size: 0.8em;
}
a {
  color: blue;
  text-decoration: none;
}
button {
  display: inline-block;
  background: #333;
  color: #fff;
  padding: 0.4rem 1.6rem;
  margin-top: 1rem;
  cursor: pointer;
}
button:hover {
  opacity: 0.8;
}
h1 {
  margin: 0.5em 0;
}