.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%;
}