/* Reset básico */
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial, Helvetica, sans-serif;
}

/* Corpo */
body{
    background:#f4f4f4;
    color:#333;
    text-align:center;
}

/* Cabeçalho */
header{
    background:black;
    color:white;
    padding:20px;
}

/* Conteúdo */
main{
    padding:40px 20px;
}

h2{
    margin-bottom:20px;
    color:black;
}

h3{
    margin-top:20px;
    color:black;
}

p{
    margin:10px 0;
}

/* Rodapé */
footer{
    background:black;
    color:white;
    padding:15px;
    margin-top:30px;
}