body, html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  height: 100%;
  background: url('background.jpg') no-repeat center center fixed;
  background-size: cover;
}
.overlay {
  background-color: rgba(0, 0, 0, 0.6);
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.container {
  color: #fff;
  text-align: center;
  padding: 20px;
}
.highlighted-action a {
  display: block;
  background-color: #ffc107;
  color: #000;
  font-weight: bold;
  padding: 14px;
  margin-bottom: 20px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 18px;
  width: 300px;
  margin: 0 auto 30px auto;
  box-shadow: 0 0 15px #ffc10788;
}
.highlighted-action a:hover {
  background-color: #ffdb58;
}
.small-buttons a {
  display: block;
  margin: 5px auto;
  padding: 10px;
  color: white;
  background-color: #333;
  text-decoration: none;
  width: 260px;
  border-radius: 5px;
  font-size: 14px;
  opacity: 0.85;
}
.small-buttons a:hover {
  background-color: #444;
  opacity: 1;
}
.button {
  display: block;
  margin: 5px auto;
  padding: 10px;
  color: white;
  background-color: #ff9800;
  text-decoration: none;
  width: 260px;
  border-radius: 5px;
  font-weight: bold;
}
.button:hover {
  background-color: #ffa733;
}