body {
        margin: 0;
        font-family: sans-serif;
        background-color: #f4f4f4;
        color: #333;
    }
    #about, .section, #footer {
    max-width: 900px;
    margin: auto;
    padding: 20px;
    }
    #about {
    background-color: #ddd;
    text-align: center;
    }
    .section {
        background-color: #fff;
    }
    #picture {
    max-width: 200px;
    width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 20px;
    border-radius: 8px;
    }
    h1, h2, h3, h4 {
        text-align: center;
    }
    a {
        color: #0066cc;
        text-decoration: none;
    }
    a:hover {
        text-decoration: underline;
    }
    .description {
        padding: 0 20px;
    }
    #footer {
    font-size: 0.9em;
    text-align: center;
    background-color: #ddd;
    }

    /* Responsivo */
    @media (max-width: 600px) {
        .description {
            padding: 0 10px;
        }
        #picture {
        max-width: 150px;
        }
    }