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

header,
footer {
    width: 100%;
}

main {
    min-height: calc(100vh - 140px);
    padding: 20px;
    text-align: center;
    background-image: url('../iconos/fondo2.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
}

main .contenido {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 30px 20px;
    border-radius: 10px;
    max-width: 90%;
}

/* Responsive menú hamburguesa */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.menu-toggle span {
    height: 3px;
    width: 25px;
    background: white;
    margin: 3px 0;
    border-radius: 2px;
}

@media(max-width:768px) {
    nav ul {
        display: none;
        flex-direction: column;
        background: #2a7d8c;
        position: absolute;
        top: 60px;
        right: 0;
        width: 200px;
        padding: 10px;
    }

    nav ul.show {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }
}