Electric indigo, also known as web indigo, is a dark color. You can already see an instance at the top right. If you are good with Indigo colors, you can quickly put this color among your favorite colors.
#F4F0FF
#EBE4FF
#D9CDFF
#BFA6FF
#A173FF
#873BFF
#7D14FF
#6F00FF
#5E01D6
#4E03AF
#2E0077
#4B0082
#FF4000
#FFB20F
#890620
#00FFEF
#E6BE8A
#1F75FE
#C9C9EE
#FF8C42
#140F2D
#EE4266
#FFD23F
#3BCEAC
#0EAD69