style.css

html,
body,
#map {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.nicebox {
  position: absolute;
  display: block;
  text-align: left;
  font-family: "Product Sans", Arial, sans-serif;
  font-size: 17.8px;
  font-style: normal;
  font-weight: 500;
  color: #4d4d4d;
  z-index: 5;
  -webkit-box-shadow: 0px 0px 10px -5px rgba(0, 0, 0, 0.35);
  -moz-box-shadow: 0px 0px 10px -5px rgba(0, 0, 0, 0.35);
  box-shadow: 0px 0px 10px -5px rgba(0, 0, 0, 0.35);
  padding: 3px 10px;
  background: rgb(255, 255, 255);
  background: linear-gradient(to bottom, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 1) 100%);
  border: rgb(229, 229, 229) 1px solid;
  border-radius: 2px;
}

.nicebox:hover {
  background: #fafafa;
}

#add_geojson_b {
  top: 60px;
  left: 10px;
  width: 149px;
  height: auto;
}

input[type="file"] {
    display: none;
}
.add_geojson_button {
    border: 0px solid rgb(190, 190, 190);
    border-radius: 2px;
    display: inline-block;
    padding: 6px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}