/* D3 styles set using CSS, so that I can quickly change it across all graph types */
/* Set size of axis tick font */
g .xAxis {
  font-size:1.2em;
}

g .yAxis {
  font-size:1.2em;
}

/* Set size of axis labels */
.label {
  font-size:1.2em;
}
/* Colours are specified in the javascript files as constants. This is so that they
can be accessed during mouse-over/mouse-out affects. The function d3.select(this).style('fill')
could also be used to select the current colour, however as there is a slight delay
it means that very fast mouse movements over the elements will not select the right colour. */