body {
    margin: 0;
    padding: 0;
    height: 100vh;
    font-family: Helvetica, Arial, sans-serif;
}

h1, h2 {
    margin: 0;
}

#map {
    height: 100%;
    width: 100%;
    z-index: 0;
    pointer-events: all;
}

/* avoid blurry edge of images */
.leaflet-image-layer {
    image-rendering: optimizeSpeed;             /* Legal fallback */
    image-rendering: -moz-crisp-edges;          /* Firefox        */
    image-rendering: -o-crisp-edges;            /* Opera          */
    image-rendering: -webkit-optimize-contrast; /* Safari         */
    image-rendering: optimize-contrast;         /* CSS3 Proposed  */
    image-rendering: crisp-edges;               /* CSS4 Proposed  */
    image-rendering: pixelated;                 /* CSS4 Proposed  */
    -ms-interpolation-mode: nearest-neighbor;   /* IE8+           */
}

.UIOverlay {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    pointer-events: none;
}

.UIOverlay > * {
    pointer-events: all;
}

header, footer, .overlay {
    color: #f2f2f2;
    text-shadow: 1px 1px 1px grey;
    background-color: rgba(17, 17, 17, 0.7);
    z-index: 5;
}

header {
    --title-bar-height: 54px;
    --title-bar-row-gap: 5px;
    height: var(--title-bar-height);
}

.TitleBarWrapper {
    position: relative;
    display: flex;
    row-gap: var(--title-bar-row-gap);
    padding: var(--title-bar-row-gap) 8px;
    align-items: center;
    box-sizing: border-box;
    height: var(--title-bar-height);
    justify-content: space-between;
}

section.MapViewport {
    display: block;
    position: relative;
    flex: auto;
    overflow: visible;
    pointer-events: none;
}

.overlay {
    margin: 0.3em;
    padding: 0.3em;
    width: fit-content;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: all;
}

section.MapViewport hr {
    color: white;
    width: 75%;
    margin-top: 0;
}

input[type=radio] {
    margin-bottom: 10px;
}

footer {
    bottom: 0;
}