body {
    font-family: Arial, Helvetica, sans-serif;
}

h1 {text-align: center;}

p.intro {
    max-width: 800px;
    margin: 2em auto;   
}

p {
    line-height: 1.4em;
}

header {
    width: 900px;
    background-color: #cfc477;
    margin: auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
}

header ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
    display: flex;
    justify-content: flex-end;
}

header ul li a {
    display: block;
    text-align: center;
    color: #0e0a7a;
    font-weight: bold;
    text-decoration: none;
    padding: 20px;
}

section {
    width: 940px;
    margin: auto;
    display: flex;
}

article {
    background-color: #e2e2f2;
    padding: 20px;
    flex: 2;
}

aside {
    background-color: #b5b3ec;
    padding: 20px;
    flex: 1;
}