body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f2f2f2;
}

.calculator-container {
    text-align: center;
    padding: 30px;
    border: 1px solid #cccccc;
    border-radius: 8px;
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
    max-width: 80%;
}

h1 {
    color: #333333;
}

label {
    display: block;
    margin-top: 10px;
    font-size: 14px;
    color: #555555;
}

input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    box-sizing: border-box;
    border: 1px solid #cccccc;
    border-radius: 4px;
}

button {
    width: 100%;
    padding: 10px;
    margin-top: 15px;
    cursor: pointer;
    background-color: #4caf50;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
}

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

p#result {
    margin-top: 20px;
    font-size: 16px;
    color: #000000;
}