html, body {
  height: 100%;
  margin: 0;
}

#map {
  height: 100%;
  width: 100%;
}

.locate-button {
  background: white;
  border: 2px solid #999;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 14px;
}

.opacity-control {
  background: white;
  padding: 8px;
  border: 2px solid #999;
  font-size: 13px;
  line-height: 1.4;
}

.opacity-control input {
  width: 140px;
}

.legend {
  background: white;
  padding: 10px;
  border: 2px solid #999;
  font-size: 13px;
  width: 220px;
}

.legend-title {
  font-weight: bold;
  margin-bottom: 6px;
}

.legend-gradient {
  height: 14px;
  width: 100%;
  border: 1px solid #777;
  margin-bottom: 4px;
}

.legend-labels {
  display: flex;
  justify-content: space-between;
}

.legend-row {
  display: flex;
  align-items: center;
  margin-bottom: 4px;
}

.legend-swatch {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 1px solid #777;
  margin-right: 6px;
}