body {
  margin: 0;
  padding: 0;
  background: #111;
  font-family: 'Segoe UI', sans-serif;
  color: #f5f5f5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  background-image:url( https://images.unsplash.com/photo-1501139083538-0139583c060f?q=80&w=870&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D) ;
 background-size: cover;        /* cover entire screen */
  background-position: center;  /* center the image */
  background-repeat: no-repeat; /* don't repeat */
  background-attachment: fixed; /* fix image on scroll */
}

h1 {
  font-size: 2.8em;
  margin-bottom: 10px;
  color: #ff3c3c;
}

.quote {
  font-style: italic;
  color: #aaa;
  margin-bottom: 30px;
}

input, button {
  padding: 10px 20px;
  font-size: 1em;
  border: none;
  border-radius: 5px;
  margin: 10px;
}

input {
  width: 250px;
  background: #222;
  color: #fff;
  border: 1px solid #444;
}

button {
  background: #ff3c3c;
  color: white;
  cursor: pointer;
}

.result {
  margin-top: 30px;
  background: #1a1a1a;
  padding: 20px;
  border-radius: 8px;
  max-width: 500px;
}

.credit-card {
  background: linear-gradient(135deg, #2d2d2d, #1a1a1a);
  padding: 20px;
  border-radius: 10px;
  margin-top: 40px;
  width: 300px;
  box-shadow: 0 0 15px #ff3c3c55;
}

.footer {
  margin-top: 40px;
  font-size: 0.9em;
  background-color: #000000;
}