<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css">
  <link rel="stylesheet" href="style.css">
  <title>Document</title>
</head>
<body>
  <h1 class='logo'>
    Solar explorer
    <span>in only CSS</span>
  </h1>
  <input class='planet9' id='pluto' type='radio' name='planet'>
  <label class='menu pluto' for='pluto