.calculator {
	background-color: #fff;
	padding: 20px;
	margin: 20px auto;
	max-width: 500px;
	border-radius: 10px;
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

form {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
}

.input {
	flex-basis: calc(50% - 10px);
	margin-bottom: 20px;
}

.input label {
	display: block;
	margin-bottom: 5px;
	font-weight: bold;
}

.input input[type="number"],
.input select {
	display: block;
	width: 100%;
	padding: 10px;
	border-radius: 5px;
	border: 1px solid #ccc;
	background-color: #f9f9f9;
  color: #000;
}

button[type="button"] {
	background-color: #4CAF50;
  color: white;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 5px;
}

button[type="reset"] {
  background-color: #f44336;
  color: white;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 5px;
}

button[type="button"]:hover, button[type="reset"]:hover {
  opacity: 0.8;
}

button:disabled {
	background-color: #ccc;
	cursor: not-allowed;
}

button[type="button"]:last-of-type {
	background-color: #f44336;
}

button span {
    font-size: large;
}

.result-input {
  border: 2px solid red !important;
}

@media (max-width: 600px) {
	.input {
		flex-basis: 100%;
	}
}