style.css

/* Body styles */
body {
  font-family: Arial, sans-serif;
  background-color: #2b2b2b;
  color: #fff;
  padding: 10px;
}

/* Calculator container styles */
.container {
  background-color: #212121;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
  transition: background 1s ease-in-out;
  -webkit-transition: background 1s ease-in-out;
  -moz-transition: background 1s ease-in-out;
  -ms-transition: background 1s ease-in-out;
  -o-transition: background 1s ease-in-out;
}

/* Calculator header styles */
.header {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 20px;
}
.footer {
  text-align: center;
  font-size: 1.1rem;
  background-color: #212121;
  padding: 20px;
  margin-bottom: 20px;
  margin: 20px 0;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
}

/* Form styles */
form {
  display: flex;
  flex-direction: column;
}

/* Label styles */
label {
  font-weight: bold;
  margin-bottom: 10px;
}

/* Input styles */
input[type="number"] {
  margin-bottom: 20px;
  padding: 10px;
  border-radius: 5px;
  border: none;
  background-color: #3c3c3c;
  color: #fff;
  font-size: 1.2rem;
  text-align: center;
}

/* Button styles */
button {
  background-color: #4caf50;
  color: #fff;
  border: none;
  padding: 10px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1.2rem;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #388e3c;
}

/* Result styles */
.result {
  margin-top: 20px;
  font-weight: bold;
  font-size: 1.5rem;
  text-align: center;
}

@media screen and (max-width: 480px) {
  /* Calculator container styles */
  .container {
    max-width: 100%;
    padding: 10px;
  }

  /* Calculator header styles */
  .header {
    font-size: 1.5rem;
  }

  /* Input styles */
  input[type="number"] {
    margin-bottom: 10px;
    font-size: 1rem;
  }

  /* Button styles */
  button {
    font-size: 1rem;
    padding: 8px;
  }

  /* Result styles */
  .result {
    font-size: 1.2rem;
  }
}