body {
    margin: 0;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

header {
    position: fixed;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

nav ul {
    list-style-type: none;
    padding: 10px;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    text-decoration: none;
    color: #333;
    font-size: 18px;
}

.background-image {
    background-image: url('fundo.jpg'); /* Substituir pelo caminho da imagem de fundo */
    background-size: cover;
    background-position: center;
    height: 100vh;
    width: 100%;
    position: absolute;
    z-index: -1;
}

.shield-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.shield {
    width: 200px; /* Tamanho do escudo */
    animation: spin 3s linear infinite;
}

@keyframes spin {
    0% { transform: rotateY(0); }
    100% { transform: rotateY(360deg); }
}

@media (max-width: 600px) {
    nav ul li {
        margin: 0 10px;
    }

    .shield {
        width: 150px; /* Tamanho do escudo para dispositivos móveis */
    }
}