* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 40px 20px;
    font-family: Arial, sans-serif;
    background: #fff;
    color: #111;
}

main {
    width: min(680px, 100%);
    margin: auto;
}

h1 {
    margin: 0 0 10px;
}

section {
    padding: 22px 0;
    border-bottom: 1px solid #ddd;
}

a {
    color: #111;
}

hr {
    margin: 36px 0;
    border: 0;
    border-top: 1px solid #ddd;
}

.button {
    display: inline-block;
    padding: 12px 16px;
    border: 0;
    background: #111;
    color: #fff;
    text-decoration: none;
    cursor: pointer;
    font: inherit;
}

li {
    margin: 8px 0;
}