Refactored backgroundGradient.js according to SIG tool feedback
Refactored backgroundGradient.js according to SIG tool feedback

ClintonCao/UnifiedASATVisualizer,ClintonCao/UnifiedASATVisualizer,ClintonCao/Contextproject-TSE,ClintonCao/UnifiedASATVisualizer,ClintonCao/Contextproject-TSE,ClintonCao/Contextproject-TSE