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             <div class="solution" id="sol" style="margin-top: 3%;">
-                <h1 style="background-color: #ffc30b; margin-top: 2%; color: white;"><b style="color: white;"><u>References</u></b></h1>
+                <h1 style="background-color: #ffc30b; margin-top: 2%; color: white;"><b><u>References</u></b></h1>
                 <p>[1] Del Rosario, J.M. et al. (2020) “Protection from influenza by intramuscular gene vector delivery of a broadly neutralizing nanobody does not depend on antibody dependent cellular cytotoxicity,” Frontiers in Immunology, 11. Available at: https://doi.org/10.3389/fimmu.2020.00627.</p>
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