body, html {
    height: 100%;
  }

body {
  /* Image from https://unsplash.com/photos/person-sitting-on-gaming-chair-while-playing-video-game-Mf23RF8xArY 
   * I've reduced the image's foodprint
   * */
  background-image: url('../images/florian-olivo-Mf23RF8xArY-unsplash_edit.jpg');
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  background-attachment: fixed;
  margin: 0;
}

h1, p {
 color: #f9fafb; 
}

div#container {
  text-align: center;
  width: 700px;
  margin: 0 auto;
  #background: rgba(249, 250, 251, 0.4);
}

span.underline {
  text-decoration: underline;
}