* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    height: 100%;
    width: 100%;
    font-family: 'Arial', sans-serif;
    overflow: hidden;
    position: relative;
}

.container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.message {
    background-color: rgba(0, 0, 0, 0.7);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    color: #fff;
    max-width: 80%;
    animation: pulse 2s infinite;
}

.message h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.message p {
    font-size: 1.2rem;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4);
    }
    70% {
        box-shadow: 0 0 0 20px rgba(255, 255, 255, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
    }
}

/* Fondo animado */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.stars, .twinkling, .clouds {
    position: absolute;
    width: 100%;
    height: 100%;
    display: block;
}

.stars {
    background: #000 url('images/stars.png') repeat top center;
    z-index: 0;
}

.twinkling {
    background: transparent url('images/twinkling.png') repeat top center;
    z-index: 1;
    animation: move-twink-back 200s linear infinite;
}

.clouds {
    background: transparent url('images/clouds.png') repeat top center;
    z-index: 2;
    opacity: 0.4;
    animation: move-clouds-back 200s linear infinite;
}

@keyframes move-twink-back {
    from {background-position: 0 0;}
    to {background-position: -10000px 5000px;}
}

@keyframes move-clouds-back {
    from {background-position: 0 0;}
    to {background-position: 10000px 0;}
}