style.css

.container {
    display: flex;
    height: 500px;
}
.container div {
    flex: 1;
}
.leaflet-top-pane {
    pointer-events: none;
}
.leaflet-popup-pane {
  z-index: 10;
}
.button {
    color: white;
    border-radius: 4px;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
    font-size: 85%;
    border: 1px solid #fefefe;
    background-color: #E6E6E6;
    text-decoration: none;
    padding: .5em 1em;
}
.button.active {
    background: #fff;
    color: #000;
    border: 1px solid #777;
}

.button-greens {
    background: rgb(28, 184, 65); /* this is a green */
}

.button-error {
    background: rgb(202, 60, 60); /* this is a maroon */
}

.button-ylorbr {
    background: rgb(223, 117, 20); /* this is an orange */
}

.button-blues {
    background: rgb(66, 184, 221); /* this is a light blue */
}
.leaflet-container .loading {
  width: 200px;
  background: rgba(255,255,255,0.8);
  padding: 20px;
  margin: 160px auto;
  position: relative;
  text-align: center;
}