page.css

html {
    height: 100%;
}
body {
    font-family: "Helvetic Neue", Helvetica, Arial, sans-serif;
    color: white;
}
h1 {
    font-size: 24px;
}

a:link, a:visited {
    color: #fffec1;
    text-decoration: none;
}
a:hover {
    color: #fff900;
}

.info {
    position: relative;
    display: inline-block;
    padding: 10px;
    background-color: rgba(0, 0, 0, 0.2);
    opacity: 1;
    transition: opacity 1s, visibility 0s 1s;
}

.info.hidden {
    opacity: 0;
    visibility: hidden;
}

.close {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 24px;
}