Hover move up or not flexbox

Hover move up or not flexbox
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#1

Have an a tag apply:

a{border-bottom: 1px solid red;}

and a hover

a:hover{border-bottom: 2px solid red;}

There is possible somehow with flexbox when hover on that a tag then the text inside a tag not move up that 1px? because first is 1px and hover 2px?

Thanks