CSS colour styling for graph titles in Elevation Profile

[cnw_ivesleung]

Hello GeoNet community,

This is my first time asking a question online! I am configuring an Elevation Profile app and looking to use css to style the graph titles in the elevation chart because the font is currently white and it blends into the white background. I like to keep the background white and change the colour of the font in the X and Y axis titles instead. I can configure profile theme colours but for some reason the graph titles are not applied. I've tried using many classes without success. 

Img shows Distance in kilometer (highlighted) in white. 

Any help is appreciated, thank you.

Ives