body {
    color: white;
    background-color: black;
    font-family: 'Times New Roman', Times, serif;
    margin: 0;
    padding: 0 10px;
}

header img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin-top: 5%;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.center {
    text-align: center;
}

h1 {
    text-align: center;
    font-family: 'Times New Roman', Times, serif;
    margin: 20px 0;
}

.imagem img {
    width: 800px;
    height: 400px;
    margin-left: auto;
    margin-right: auto;
    display: block;
    max-width: 100%;
    height: auto;
}

main section p {
    max-width: 900px;
    margin: 20px auto;
    line-height: 1.6em;
    font-size: 18px;
    padding: 0 10px;
}

footer {
    display: flex;
    flex-direction: column; /* vertical */
    align-items: center; /* centralizar */
    justify-content: center;
    background-color: rgb(25, 64, 184);
    height: 250px;
    color: white;
    padding: 20px;
}

footer img {
    width: 25px;
    height: 25px;
    display: block;
    margin-top: 100px;
    margin-bottom: 5px;
    margin-left: auto;
    margin-right: auto;
}

footer a {
    text-align: center;
    color: white;
    text-decoration: none;
}

footer a:hover {
    color: fuchsia;
}

footer p {
    margin-top: 2px;
    margin-bottom: 2px;
}

footer .copyright {
    margin-top: 10px;
    font-family: 'Times New Roman', Times, serif;
}

/* RESPONSIVIDADE */

@media (max-width: 900px) {
    .imagem img {
        width: 100%;
        height: auto;
    }

    main section p {
        font-size: 16px;
        padding: 0 5px;
    }

    footer {
        height: auto;
        padding: 30px 10px;
    }

    footer img {
        margin-top: 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.3rem;
        margin: 15px 0;
        padding: 0 5px;
    }

    main section p {
        font-size: 14px;
        line-height: 1.4em;
        padding: 0 10px;
    }
}