html { 
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 16px;
    width: 100%;
    height: 100%;
    
    background:
    radial-gradient(#000 0.75px,transparent 0.5px) 0   0   /3px 3px,
    radial-gradient(#000 0.75px,transparent 0.5px) 1px 1px /3px 3px,
    radial-gradient(#000 0.75px,transparent 0.5px) 2px 2px /3px 3px,
    url(images/bg.jpg) center/cover;

  }

  h1 {
    margin: 0;
    padding: 0;
    font-weight: 900;
    font-size: 4.25em;
  }

  #intro {
      margin-top: 25%;
      color: #ffffff;
      text-align: right;
      padding-right: 30px;
  }

  .explain {
      font-size: 1.5em;
      margin: 0;
      padding: 0;
  }