It's not too bright and not too dark. It's perfect.
I like light blue because it's not too bright and not too dark. It's the perfect color.
ご質問ありがとうございます。
・It's not too bright and not too dark. It's perfect.
＝「暗すぎず明るすぎず、ちょうどいいです。」
（例文）I like green because it's not too bright and not too dark. It's perfect.
（訳）暗すぎず明るすぎず、ちょうどいいので緑が好きです。
・I like light blue because it's not too bright and not too dark. It's the perfect color.
＝暗すぎず明るすぎず、パーフェクトな色なので水色が好きです。
お役に立てれば嬉しいです。
Coco
I like light blue because it's not too dark, and not to light. It's the perfect colour for me.
ーI like light blue because it's not too dark, and not to light. It's the perfect colour for me.
「私は暗すぎず、明るすぎない水色が好きです。私にとって完璧な色です」
light blue で「水色」
it's not too dark, and not to light で「暗すぎず明るすぎない」
perfect colour for me で「完璧な色」＝「ぴったりの色」
ご参考まで！
日本 
カナダ 
