In Supergirl s2 e1 named The Adventures of Supergirl, Superman gets introduced.
But it can be easily noticed that the insignia of House-of-El that is the iconic S symbol is different in Superman's suit than from that in Kara aka Supergirl's suit.
Specifically, the background of the insignia is glaring golden-yellow in Superman's suit while it is absent in Supergirl's suit.
Now, as we all know the symbol typically comes with the yellow background in the comics.
But why is the insignia different here in Supergirl's suit? Why is the background not yellow in her suit?
Is there any reasonable explanation behind this or am I being too pedantic? Or am I missing something?
I know her suit was inspired from that of Cavill which also lacks the distinct bright yellow background but still the yellow color does appear in the insignia of his suit.
Is there a Superverse explanation?