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

body {
    background-color: #f4f4f4;
    color: #333;
}

h2 {
    color: #333;
}

p {
    margin-bottom: 15px;
}

ol {
    margin-left: 20px;
}

/* guia */
header {
    background-color: #4CAF50;
    color: white;
    padding: 20px;
    text-align: center;
}

section {
     margin: 20px;
}

footer {
    background-color: #333;
    color: white;
     text-align: center;
    padding: 10px;
    width: 100%;
}