@metacharset "utf-8";

            body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #222;
            color: #fff;
        }
        header {
            background-color: #111;
            padding: 20px;
            text-align: center;
        }
        nav {
            background-color: #333;
            padding: 10px;
            text-align: center;
            font-size: 2em;
        }
        nav a {
            color: #fff;
            text-decoration: none;
            margin: 0 10px;
        }
        section {
            padding: 20px;
        }
        footer {
            background-color: #111;
            padding: 10px;
            text-align: center;
            position: fixed;
            bottom: 0;
            width: 100%;
        }
        .contenido {
            text-align: justify;
        }
        .caja {
            width: 80%;
            margin-left:auto;
            margin-right:auto;
        }
        img {
            width: 80%;
        }
        iframe{
            margin-left: auto;
            margin-right: auto;
        }

        .video{
            display: flex;
            flex-direction: center;
        }