.intro {
    text-align: center;
}

.nav {
    background-image: url("gradient-navbar.png");
    background-size: 150% 100%;
}

body {
    background-image: url("gradient.png");
    background-attachment: fixed;
    background-size: 100% 100%;
}

.content .examples {
    font-family: "Times New Roman";
}

note {
    color: gray;
    font-size: 0.625em;
    display: block;
    padding-top: 3px;
    padding-bottom: 3px;
}

*::selection {
    color: #01f;
}

math {
    padding-top: 0.2em;
    padding-bottom: 0.2em;
}

li {
    padding-top: 10px;
    padding-bottom: 10px;
}