* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #121212; /* Darker background for modern look */
  font-family: 'Arial', sans-serif;
  user-select: none;
}

.card {
  background-color: slateblue;
  border: 2px solid yellow;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  height: auto;
  width: 300px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.head-main {
  color: #fff;
  font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
  text-align: center;
  margin-bottom: 15px;
  font-size: 1.2rem;
}

#input-data {
  width: 100%;
  padding: 8px;
  border-radius: 6px;
  border: none;
  margin-bottom: 15px;
  font-size: 1rem;
}

.qr-img {
  margin: 10px auto;
  height: 150px;
  width: 150px;
  border: 2px solid #fff;
  border-radius: 8px;
  background: #fff;
}

#gnrt_button {
  background-color: yellow;
  color: #000;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#gnrt_button:hover {
  background-color: gold;
}