.calculator {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

label {
  display: block;
  font-size: 18px;
  margin-bottom: 10px;
}

input[type="number"] {
  display: block;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 5px;
  margin-bottom: 20px;
  font-size: 16px;
	border: 1px solid #ccc;
}

button[type="button"] {
  display: block;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 5px;
  margin-bottom: 20px;
  font-size: 18px;
  background-color: #4CAF50;
  color: #fff;
  cursor: pointer;
}


button[type="reset"] {
    background-color: #f44336;
  display: block;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 5px;
  margin-bottom: 20px;
  font-size: 18px;
  color: #fff;
  cursor: pointer;
}

button:hover {
    opacity: 0.8;
}

#result {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 20px;
}

@media only screen and (max-width: 600px) {
  .calculator {
    padding: 10px;
  }
  
  input[type="number"] {
    font-size: 16px;
  }
  
  button {
    font-size: 16px;
  }
  
  #result {
    font-size: 20px;
  }
}