CSS conflict with ScatterD3

[Tixierae]

LDAvis includes the following rule (at the top of the lda.css file):

path {
   fill: none;
   stroke: none;
}

which applies to all path SVG elements and removes their drawing and fill color. That makes the symbols in scatterD3's legend invisible (inside a Shiny app). Potentially this could create issues with other html widgets.

See issue there: juba/scatterD3#77