html,
body {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
}

.leaflet-container {
  flex: 2;
  min-width: 300px;
  min-height: 60vh;
}

#options {
  flex: 1;
  min-width: 300px;
}

file-drop {
  position: relative;
  box-sizing: border-box;
  display: block;
  padding: 10px;
  background-color: rgba(245, 234, 174, 0.2);
  overflow: hidden;
  touch-action: none;
}
file-drop::after {
  content: '';
  position: absolute;
  display: block;
  left: 2px;
  top: 2px;
  right: 2px;
  bottom: 2px;
  border: 2px dashed #fff;
  background-color: rgba(88, 116, 88, 0.2);
  border-color: rgba(65, 129, 65, 0.5);
  border-radius: 10px;
  opacity: 0;
  transform: scale(0.95);
  transition: all 200ms ease-in;
  transition-property: transform, opacity;
  pointer-events: none;
}

.drop-valid::after {
  opacity: 1;
  transform: scale(1);
  transition-timing-function: ease-out;
}

.drop-invalid::after {
  background-color: rgba(255, 27, 27, 0.2);
  border-color: rgba(255, 170, 170, 0.5);
  opacity: 1;
  transform: scale(1);
  transition-timing-function: ease-out;
}