.leaflet-measure-path-measurement {
  position: absolute;
  font-size: 10px;
  color: black;
  text-shadow: -1px  0 0 white,
               -1px -1px 0 white,
                0 -1px 0 white,
                1px -1px 0 white,
                1px  0 0 white,
                1px  1px 0 white,
                0  1px 0 white,
               -1px  1px 0 white;
  white-space: nowrap;
  transform-origin: 0;
  pointer-events: none;
}

.leaflet-measure-path-measurement > div {
  position: relative;
  margin-top: -25%;
  left: -50%;
}