body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(to bottom, #4a90e2, #50c1e9);
  color: #fff;
  display: flex;
  /* new code add for footer*/
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #2a3d66;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  text-align: center;
  width: 90%;
  max-width: 400px;
}

.container h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

form {
  display: flex;
  flex-direction: column;
}

label {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  text-align: left;
  color: #b0c4de;
}

input[type="text"],
input[type="number"] {
  padding: 0.8rem;
  margin-bottom: 1rem;
  border: none;
  border-radius: 5px;
  font-size: 1rem;
}

input[type="submit"] {
  padding: 0.8rem;
  border: none;
  border-radius: 5px;
  background: #50c1e9;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

input[type="submit"]:hover {
  background: #3a9bc7;
}

.result {
  margin-top: 1.5rem;
  font-size: 1.2rem;
  background: #364d79;
  padding: 1rem;
  border-radius: 5px;
}


footer{
    margin-top: 15px;
    text-align: center;
    font-size: 20px;
}

/* for mobile friendly*/

@media (max-width: 480px) {
  body {
    align-items: flex-start;
    padding: 20px 0;
    height: auto;
    min-height: 100vh;
  }

  .container {
    width: 90%;
    padding: 1.5rem;
    margin: 20px 0;
  }

  .container h1 {
    font-size: 1.8rem;
  }

  input[type="text"],
  input[type="number"],
  input[type="submit"] {
    width: 100%;
    box-sizing: border-box;
  }
}