body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background: #333;
    color: white;
    padding: 1rem 0;
    text-align: center;
}

section {
    padding: 20px;
    margin: 20px;
    background: white;
    border-radius: 5px;
}

.example {
    margin-top: 20px;
    text-align: center;
}

.box {
    width: 100px;
    height: 100px;
    background-color: #3498db;
    margin: 0 auto;
    border-radius: 10px;
    animation: moveBox 5s ease-in-out infinite;
}

@keyframes moveBox {
    0% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(200px);
    }
    100% {
        transform: translateX(0);
    }
}

.highlight {
    background-color: #ffeb3b;
    font-weight: bold;
}