.leaflet-measure-path-measurement {
    font-size: 10px;
    padding: 2px;
    border-radius: 2px;
    text-align: center;
    color: #fb0606;
    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;
}