Why, when the transition to the hover test becomes cloudy?

Put the button on hover to transition opacity worked smoothly, but faced such problem that at the time of the animation, the text becomes turbid and then back to normal. here is a screen
Normal state

and it hover

Tell me what's the problem?
July 9th 19 at 11:22
1 answer
July 9th 19 at 11:24
Try to mark the button on a separate layer in another unit. Here is an example of solving such problems: stackoverflow.com/questions/26388769/css3-animatio...

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