html {
  height: 100%;
  width: 100%;
  overflow: hidden;
}
#map {
  width: 100%;
  height: 650px;
}
#expandBox {
  width: 10px;
  height: 10px;
  overflow: auto;
  z-index: 10;
  border: 0px solid;
  background-color: green;
  margin: 0px;
  position: absolute;
bottom: 0;
  right:0;
  resize: both;
}
#bounds {
  border: 3px solid black;
  z-index: 7;
}
#checkbox {
  position: absolute;
  top: 150px;
  left: 20px;
  background-color: white;
  border: 0px;
  z-index: 3;
}
#checkbox:hover {
  background-color: #22d822;
}
#explain {
  background-color: gray;
  color: white;
  font-family: 'Roboto', sans-serif;
  width: 183px;
  height: 17.5px;
  position: absolute;
  top: 150px;
  left: 45px;
}