body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}

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

main {
    padding: 2rem;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
}

h1 {
    animation: color-change 2s infinite;
}

@keyframes color-change {
    0% { color: red; }
    50% { color: blue; }
    100% { color: red; }
}

.animated-text {
    animation: text-animation 2s ease-in-out infinite;
}

@keyframes text-animation {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.7;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}