body {
  font-family: Sans-Serif;
  color: white;
}

header {
  text-align: center;
  border: 3px solid black;
  border-radius: 16px;
  max-width: 500px;
  margin: 30px auto;
}
h1 {
  font-size: 45px;
  font-weight: 700;
  color: black;
}
main {
  padding: 20px;
  border-radius: 20px;
  border: 17px;
  background: black;
  max-width: 500px;
  margin: 0 auto 30px;
}
p {
  color: white;
  font-size: 17px;
  padding: 13px;
}

span {
  color: white;
  font-size: 17px;
}

nav a {
  color: white;
  background: black;
  padding: 16px 16px;
  border-radius: 16px;
  box-shadow: 3px 3px 0 gray;
  text-decoration: none;
}
nav {
  margin-bottom: 35px;
  text-align: center;
}