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

body {
    background-color: #f2f2f2;
    padding: 25px;
}

h1 {
    color: slateblue;
    text-align: center;
    border-bottom: solid thin black;
    padding-bottom: 5px;
    margin-bottom: 20px;
}

h2 {
    margin: 40px 0px 20px 0px;
}

p,
li {
    font-size: 18px;
    color: black;
}

img,
iframe {
    border: 2px solid black;
    border-radius: 15px;
    padding: 5px;
    box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.2);
}

figure {
    display: inline-block;
}

figcaption {
    font-style: italic;
    text-align: center;
    margin-top: 5px;
}