html, body {
  height: 100%;
  width: 100%;
}
body {
    display: flex;
}

#root {
  flex: 1 1;
  display: flex;
  flex-direction: column;
  transition: all 0.5s ease;
}

#map {
  flex-grow: 1;
  position: relative;
}

#lowpane {
  position: relative;
  height: 50px;
}

#slider {
  top: 5px;
  left: 50px;
}

.center-cross::after {
  content: url('images/crosshairs.png');
  z-index: 1000;
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}