Update cv.md

_pages/cv.md

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 ## Publication
 
 You may also refer to my [Google Scholar](https://scholar.google.ca/citations?hl=en&user=0Cyfqv4AAAAJ&view_op=list_works&sortby=pubdate) for an updated list of publications.<br>
-<span style="color: orange;">●</span> denotes my role as <span style="color: orange;">(Co-)senior author(s)</span>, whereas ■ denotes my role as main author(s).
+<span style="color: orange;">●</span> denotes my role as <span style="color: orange;">(Co-)senior author(s)</span>, whereas <span style="color: teal;">■</span> denotes my role as <span style="color: teal;">main author(s)</span>.
 ### Conferences
 
 <ul>