body {
    background-color: lightyellow;
}

h1 {
    text-align: center;
    font-family: helvetica, sans-serif;
    font-weight: bold;
    color: darkslategrey;
}
p {
    text-align: center;
    font-family: helvetica, sans-serif;
    color: darkslategrey;
}
ul {
    display: flex;
    list-style: none;
    align-content: center;
    margin-left: 10px;
}
li {
    margin-left: 10px;
    margin-right: 10px;
}
img {
    border: solid, 2px, black;
    display: block;
    margin-left: 10%;
    margin-right: auto;
}
figcaption{
    text-align: center;
}
video, audio {
    display: block;
    margin-left: auto;
    margin-right: auto;
}
nav {
    text-align: center;
}