turn step zero aqua

//   Entering Step Zero
      d3.select("#step-zero").on('stepin',function(e) {
        console.log("We've arrived at STEP ZERO")
        d3.select("#step-zero").style('background-color', 'aqua')
        d3.select("#bubblePolygon").classed('hidden', true)
      })

      //   Leaving Step Zero
d3.select("#step-zero").on('stepout',function(e) {
        console.log("We've left STEP ZERO")
        // d3.select("#step-zero").style('background-color', 'aqua')
      })