* {
	box-sizing: border-box;
}

body {
	font-family: Arial, sans-serif;
	background-color: #f5f5f5;
	margin: 0;
}

.container {
	max-width: 800px;
	margin: 0 auto;
	padding: 20px;
	background-color: #fff;
	box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

h1 {
	text-align: center;
	margin-top: 0;
}

form {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	margin-bottom: 20px;
}

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

label {
	display: block;
	margin-bottom: 5px;
}

input {
	padding: 5px;
	border-radius: 3px;
	border: 1px solid #ccc;
	font-size: 16px;
	width: 100%;
}

button {
	padding: 10px;
	background-color: #007bff;
	color: #fff;
	border: none;
	border-radius: 3px;
	font-size: 16px;
	cursor: pointer;
}

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

#result {
	margin-bottom: 20px;
	font-size: 18px;
	font-weight: bold;
}

#result span {
	color: #007bff;
}

#error-msg {
	color: red;
	font-size: 16px;
	font-weight: bold;
	margin-top: 10px;
}