demo.css

body,
html {
    border: 0;
    padding: 0;
    margin: 0;
}

#map {
    width: 100vw;
    height: 100vh;
    background: grey;
}

#rtsControlUI {
    position: absolute;
    top: 0;
    right: 0;
}

#urlTemplateUI {
    position: fixed;
    top: 60px;
    left: 10px;
    background: #000;
    color: #cbdace;
}

#urlTemplate {
    margin: 2px;
    width: 300px;
    resize: none;
    field-sizing: content;
    border: 2px;
    background-color: #808080;
    color: #f0f0f0;
}

[data-title]:hover:after {
    visibility: visible;
}

[data-title]:after {
    content: attr(data-title);
    background-color: #808080;
    color: #f0f0f0;
    position: absolute;
    padding: 4px 8px 4px 8px;
    visibility: hidden;
    right: 100%;
    white-space: nowrap;
}

.info {
    color: #ffffff;
    text-decoration: none !important;
}