body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
    color: white;
    text-align: center;
}

header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 20px;
    z-index: 2;
}

.logo img {
    height: 50%;
}

h1 {
    margin: 10px 0 0;
    font-size: 2.5em;
}

main {
    position: relative;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-size: cover;
    background-position: center;
    animation: changeBackground 25s infinite;
}

@keyframes changeBackground {
    0%, 33.33% { background-image: url('imagen/foto1.webp'); }
    33.33%, 66.66% { background-image: url('imagen/foto2.webp'); }
    66.66%, 100% { background-image: url('imagen/foto3.webp'); }
}

.content {
    background: rgba(0, 0, 0, 0.5);
    padding: 20px;
    border-radius: 10px;
    max-width: 600px;
    margin: 0 auto;
}