body {
    margin: 0;
    font: 130% / 1.4 'Open Sans', 'Helvetica Neue Light', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
}
ul {
    margin: 0;
}
p {
    margin-top: 0;
}

header {
    text-align: center;
    padding: 20px 0;
    border-bottom: 1px solid #aaa;
}

main {
    max-width: 980px;
    margin: 0 auto;
    padding: 15px 0;
    display: flex;
    align-items: flex-start;
}
article {
    flex: 1;
}
aside {
    /* Used by sticky script */
    position: relative;

    flex: 0 0 250px;
    padding: 20px;
    margin: 0 0 0 20px;
    box-sizing: border-box;

    border-left: 2px solid #f1f1f1;
    background: #f8f8f8;

    overflow: auto;
}
aside::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}
aside::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, .2);
}

aside h3 {
    margin-top: 0;
}

footer {
    text-align: center;
    padding: 20px 0 300px;
    border-top: 1px solid #aaa;
}