body {
    font-family: Arial, sans-serif;
    background-color: #f3f3f3;
    margin: 0;
    padding: 0;
}

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

.calculator {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 350px;
}

.calculator h2 {
    color: #333;
    text-align: center;
}

.calculator label {
    color: #666;
}

.calculator input {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 5px 0 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.calculator button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s;
}

.calculator button:hover {
    background-color: #45a049;
}

.result {
    margin-top: 20px;
    padding: 10px;
    background-color: #e9f5e9;
    border: 1px solid #4CAF50;
    border-radius: 5px;
    text-align: center;
    color: #333;
}