body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}
header, footer {
  background-color: #003366;
  color: white;
  text-align: center;
  padding: 1em;
}
nav a {
  margin: 0 10px;
  color: white;
  text-decoration: none;
}
main {
  padding: 2em;
  max-width: 800px;
  margin: auto;
  background: white;
}
.layanan {
  margin-top: 1em;
}
.slider {
  position: relative;
  max-width: 100%;
  margin: 20px auto;
}
.slider img {
  width: 100%;
  display: none;
}
.slider img.active {
  display: block;
}