border surrounding social media buttons after updating

In case this is still present for you, or anybody else:

replace in line 11 of see_style.css
border: 1px solid #D9D9D9;
with
border: none;

As always, a backup of the original file before doing any modification is strongly suggested.

This has to be re-done after each update of the plugin.

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Alternatively you may consider creating a child theme, or add custom css code somewhere else if supported by your theme for example. When using this method there’s no need of modifying the original file after each update, but it requires a little bit more knowledge of css.