Shrink the text size based on the container width.

text-shrink.js

$(document).ready(function(){
  //Span that the text lives
  $('.class-name').each(function(){
    //Get the width of the span
    var textWidth = $(this).width();
    //If the width of the span is greater than 105px then run the if.
    if(textWidth > 105){
      //Your class that shrinks the the font size
      $(this).addClass('graph-text-smaller');
    }
  });
});