<a> tag is not at the same size of <img> tag inside it

If the inline-block declaration is not enough, check the line-height…

<a href="" style="line-height: 1;">
   <img src="logo.jpg" alt="logo">
</a>

Try adding display:inline-block to the <a> element.

What worked for me was adding a z-index to the anchor tag.

position: absolute; 
z-index: 2

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