increases the opacity of the hint when the border is dark
increases the opacity of the hint when the border is dark

CartoDB/cartodb,bloomberg/cartodb,UCL-ShippingGroup/cartodb-1,DigitalCoder/cartodb,future-analytics/cartodb,UCL-ShippingGroup/cartodb-1,future-analytics/cartodb,splashblot/dronedb,bloomberg/cartodb,future-analytics/cartodb,nuxcode/cartodb,DigitalCoder/cartodb,raquel-ucl/cartodb,splashblot/dronedb,nuxcode/cartodb,nyimbi/cartodb,raquel-ucl/cartodb,splashblot/dronedb,dbirchak/cartodb,nuxcode/cartodb,thorncp/cartodb,future-analytics/cartodb,dbirchak/cartodb,codeandtheory/cartodb,CartoDB/cartodb,nyimbi/cartodb,thorncp/cartodb,dbirchak/cartodb,codeandtheory/cartodb,nuxcode/cartodb,codeandtheory/cartodb,DigitalCoder/cartodb,bloomberg/cartodb,CartoDB/cartodb,thorncp/cartodb,raquel-ucl/cartodb,DigitalCoder/cartodb,UCL-ShippingGroup/cartodb-1,bloomberg/cartodb,CartoDB/cartodb,nyimbi/cartodb,bloomberg/cartodb,dbirchak/cartodb,raquel-ucl/cartodb,codeandtheory/cartodb,DigitalCoder/cartodb,splashblot/dronedb,UCL-ShippingGroup/cartodb-1,nuxcode/cartodb,CartoDB/cartodb,nyimbi/cartodb,thorncp/cartodb,codeandtheory/cartodb,dbirchak/cartodb,future-analytics/cartodb,splashblot/dronedb,thorncp/cartodb,raquel-ucl/cartodb,UCL-ShippingGroup/cartodb-1,nyimbi/cartodb