body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f4f8;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: #333;
    padding: 20px;
    box-sizing: border-box;
}

.calculator-container {
    background-color: #ffffff;
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

.calculator-container:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

button {
    width: 100%;
    padding: 15px;
    background-color: #17a096;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
    background-color: #17a096d4;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}