* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

h1 {
    background-color: #222;
    color: #fff;
}

h1,
h2,
h3 {
    padding: 20px;
    text-align: center;
}

section {
    margin: 40px 20px;
}
section p{
    margin: 10px auto;
}
table {
    width: 90%;
    border-collapse: collapse;
    margin: auto;
}

caption {
    margin: 20px auto;
    font-weight: bold;
}

th,
td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

th {
    background-color: #222;
    color: #fff;
    text-align: center;
}

tr:nth-child(odd){
    background-color: #ddd;
}

td code{
    padding: 2px 4px;
}

code {
    background-color: #eee;
    border-radius: 4px;
    padding: 0px 4px;
}

.comment {
  color: dimgray;
  font-style: italic;
  font-size: smaller;
}

ul {
    list-style-type: disc;
    margin: 20px auto;
    width: 90%;
}
dl,dt{
    margin: 20px auto;
    width: 90%;
}
dt{
    font-weight: bold;
}
footer{
    background: #222;
    color: #fff;
    text-align: center;
    font-size: smaller;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}
footer p{
    padding: 6px;
}
footer a{
    color: cadetblue;
}