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Colias croceus
40 - 50mm wingspan, some females can be more pale yellow closer to white.
This one on a meadow around 600m altitude... In southern Europe all year round, and in rest of the Europe more like a migrant during the summer months.
Thanks Atul!
After you gave me a direction, I made a quick check an you are right, it's common around here... I will update it later.