html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  color: #C0C0C0;
}
body {
  background: url("connected.jpg") no-repeat center center fixed;
  background-size: cover;
}
#wrapper {
  max-width: 800px;
  width: 90%;
  margin: 5vh auto;
  padding: 20px;
  background: rgba(0, 0, 0, 0.5);
  box-sizing: border-box;
}
a:link, a:visited, a:hover {
  color: #C0C0C0;
  font-style: italic;
  text-decoration: none;
}
a.to-top {
  display: block;
  margin-top: 100px;
  font-weight: bold;
  padding-bottom: 30px;
  font-size: 24px;
  text-align: center;
}
@media (max-width: 768px) {
  #wrapper {
    width: 95%;
    margin-top: 4vh;
  }
  a.to-top {
    font-size: 20px;
  }
}
@media (max-width: 480px) {
  #wrapper {
    padding: 15px;
    margin-top: 3vh;
  }
  a.to-top {
    font-size: 18px;
  }
}