body {
      background-image: url(https://pixabay.com/static/uploads/photo/2014/06/16/23/39/black-370118_960_720.png);
      background-repeat: no-repeat;
      background-position: column;
      background-size: cover;
      display: flex;
      
      
    }
    
    h1{
  color: white;
  text-align: center;
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translate(-50%, -50%); 
  color: white;
    }

    .pdf-link {
      color: white;
      font-weight: bold;
      margin-top: 200px;
      text-decoration: none;
      align-self: flex-start;
      margin-left:100px ;
       background: rgba(255,255,255,0.1);
    padding: 8px 15px;
  border-radius: 6px;
  border: 1px solid white;
    }

    .pdf-link:hover {
      text-decoration: underline;
      color: skyblue;
      background: rgba(255,255,255,0.2);
    }
    .container {
  display: flex;
  flex-direction: column;
  align-items: center;
    }