/* Reset default styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Body Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #ffffff;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Main Container */
div {
    background: rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    text-align: center;
    backdrop-filter: blur(10px);
}

/* Heading */
h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

/* Display */
#display {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 30px;
}

/* Button Styles */
button {
    padding: 12px 24px;
    margin: 0 8px;
    font-size: 1rem;
    font-weight: 500;
    color: #fff;
    background-color: #4b6cb7;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background-color: #3b4c9a;
    transform: scale(1.05);
}

button:active {
    transform: scale(0.95);
}