body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(to right bottom, #3498db, #2c3e50);
}

.calculator-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.calculator-card {
    background-color: #ffffff;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: 10px;
    width: 300px;
    text-align: center;
}

h2 {
    color: #333333;
}

.input-container {
    text-align: left;
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #333333;
}

input, select {
    width: calc(100% - 16px);
    padding: 8px;
    margin-bottom: 10px;
    box-sizing: border-box;
}

button {
    background-color: #2ecc71;
    color: white;
    padding: 10px 15px;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    width: 100%;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #27ae60;
}

#result {
    margin-top: 20px;
    color: #333333;
}