[Solved]-c3 graph in a dark background; how to change axis and tick value color-d3.js

Try also changing the color of the fill if you don't want to use a stroke:

path.domain { fill: white; }
.tick text { fill: yellow; }
.c3-legend-item text { fill: grey; }

You can attempt to adjust the CSS properties of the path and line. See the example CSS below as a helper.

.c3 .c3-axis-x path,
.c3 .c3-axis-x line {
  stroke: red;
}

.c3 .c3-axis-y path,
.c3 .c3-axis-y line {
  stroke: blue;
}

.c3 path, .c3 line, .tick text { 
  stroke: white;
}