body {
  background-color: black;
  color: white;
  font-size: 25px;
}

.header {
  width: 1000px;
  margin: auto;

}

.content {
  width: 600px;
  margin: auto;
}


button {
  font-size: 20px;
}

#menu {
  display: flex;
  justify-content: center;
}

#menu a {
  padding: 14px 16px;
  font-size: 30px;
  text-decoration: none;
  color: white;
}

#menu a:hover {
  color: grey;
}

#menu a.active {
  color: red;
}