style.css

p {
  margin: 8px 0;
}
h2 {
  margin-top: 0;
}
label {
  display: inline-block;
  font-style: italic;
}
svg g * {
  transform-box: fill-box;
  transform-origin: center;
}
.group {
  display: inline-block;
  vertical-align: top;
  margin: 10px;
}
.control_row {
  margin: 8px 0;
  vertical-align: middle;
}
.control_label {
  width: 190px;
}
#landmark_update_help {
  display: none;
  width: 300px;
  margin-left: 195px;
  margin-top: 5px;
}
.move_button {
  width: 36px;
  height: 36px;
  font-family: "system-ui", "Segoe UI Adjusted", "Segoe UI", "Liberation Sans", sans-serif;
}
.matrix {
  /* https://stackoverflow.com/a/11561235 */
  display: inline-block;
  position: relative;
  vertical-align: middle;
  padding: 1px 2px;
  margin: 5px 0px;
}
.matrix:before, .matrix:after {
  content: "";
  position: absolute;
  top: 1px;
  border: 1px solid #000;
  width: 6px;
  bottom: 1px;
}
.matrix:before {
  left: 0px;
  border-right: 0px;
}
.matrix:after {
  right: 0px;
  border-left: 0px;
}
.matrix td {
  padding: 3px 5px;
  text-align: center;
}