* {
    box-sizing: border-box;
}

body {
    margin: 0 auto;
    color: #222;
    font-family: 'Open Sans', arial, sans-serif;
    min-width: min-content;
    min-height: 100vh;
    font-size: 16px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    max-width: 900px;
}

#main-wrapper {
    flex-grow: 1;
}

main {
    max-width: 1024px;
    margin: 0 auto;
}

a:visited {
    color: inherit;
}

header {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* height: 360px; */
    margin: 0;
    /* background: linear-gradient(0deg, rgba(9, 9, 121, 1) 0%, rgba(0, 212, 255, 1) 100%); */
    /* color: white; */
}

footer {
    width: 100%;
    min-height: 120px;
    background: gray;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 12px;
    margin-top: 64px;
}

h1 {
    font-size: 2.5em;
    font-weight: 400;
}

h2 {
    font-size: 1.6em;
    font-weight: 300;
    margin: 64px 0 12px;
    padding: 5px;
    background-color: rgba(0,0,0, 0.1);
}

h3 {
    display: inline-block;
    font-weight: 300;
    margin: 32px 0 0px;
    background-color: rgba(0, 0, 0, 0.1);
    padding: 5px;
}

header h1 {
    width: auto;
    font-size: 2.8em;
    margin: 0;
}

header h2 {
    width: auto;
    margin: 0;
}

nav {
    /* display: grid; */
    display: flex;
    flex-direction: row;
    align-items: center;
    width: 100%;
    max-width: 100%;
    /* grid-template-columns: repeat(auto-fit, 240px); */
    justify-content: center;
    border-bottom: 1px solid #efefef;
}

nav > a {
    color: #444;
    display: block;
    flex: 1;
    font-size: 18px;
    padding: 20px 0;
    text-align: center;
    text-decoration: none;
}

nav>a:hover {
    text-decoration: underline;
}

nav.collection {
    border: none;
}

nav.collection>ul {
    padding: 0;
    list-style: none;
}

nav.collection>ul>li {
    padding: 4px 0;
}

nav.collection>ul>li.selected {
    font-weight: 600;
}

nav.collection a {
    text-decoration: none;
}

nav.collection a:hover {
    text-decoration: underline;
}

section.columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 488px));
    grid-gap: 48px;
    justify-content: center;
}

section.columns>div {
    flex: 1;
}

section.examples {
    display: grid;
    grid-template-columns: 240px minmax(400px, 784px);
    grid-gap: 48px;
    justify-content: center;
}

section.examples h2:first-of-type {
    margin-top: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    font-weight: 600;
}

td,
th {
    border: solid 1px #aaa;
    padding: 4px;
    text-align: left;
    vertical-align: top;
}