fgdata/webgui/widgets/map.html

<style>
.aircraft-marker-icon {
	background-color: rgba(255, 255, 255, 0);
}

.aircraft-marker-icon path {
	fill: rgba(0, 255, 0, 0.4);
}

.aircraft-marker-popup .leaflet-popup-tip {
	display: none;
}

.aircraft-marker-popup .leaflet-popup-content-wrapper {
	background-color: rgba(255, 255, 255, 0.50);
}

.aircraft-marker-popup .leaflet-popup-content {
	margin: 5px 5px;
}

.aircraft-marker-altitude {
  width: 33%;
}

.aircraft-marker-heading {
  text-align: center;
  width: 33%;
}

.aircraft-marker {
	float: left;
	color: #00ff00;
	text-shadow: 1px 1px #404040;
}

.aircraft-marker span {
	padding-left: 0.5em;
}
</style>