html,
body {
  margin: 0;
  padding: 0;
}

#bg{
  position:absolute;
  z-index:-1;
  top:0;
  left:0;
}

#bar{
  margin:0;
  padding:25px;
  width:100%;
  height:80px;
  background-color:rgba(0, 0, 0, 0.55);
}

h1, p {
  margin:0;
  font-family:Helvetica, Arial, sans-serif;
  color:#dddddd;
}

a.button {
  display: inline-block;
  padding: 10px 20px;
  background-color: #4caf50;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

a.button:hover {
  background-color: #45a049;
}