body {
          padding-top: 20px;
          padding-bottom: 40px;
          background-image: url('/i/b.png');
          background-attachment: fixed;
          background-position: center;
      }
      /* Custom container */
      .container-narrow {
          margin: 0 auto;
          max-width: 900px;
      }
      .container-narrow > hr {
          margin: 30px 0;
      }
      /* Main marketing message and sign up button */
      .jumbotron {
          margin: 60px 0;
          text-align: center;
      }
      .jumbotron h1 {
          font-size: 72px;
          line-height: 1;
          color: #00ff00;
      }
      .jumbotron .btn {
          font-size: 21px;
          padding: 14px 24px;
      }
      /* Supporting marketing content */
      .marketing {
          margin: 60px 0;
      }
      .marketing p + h4 {
          margin-top: 28px;
      }
      h2 {
          font-size: 24px;
          text-align: center;
          white-space: normal;
          color: #00ff00;
      }

.darker{
        background-color: #000;
    background-color: rgba(0,0,0,0.4);
    padding: 0.5em;
}