Update default.html

Author: sichkar-valentyn

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@@ -46,7 +46,9 @@ <h1 id="neural-networks-for-computer-vision">Neural Networks for Computer Vision
 <br /><a href="https://doi.org/10.5281/zenodo.1317904"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.1317904.svg" alt="DOI" /></a></p>
 
 <h3 id="explore-course">Course:</h3>        
-<p>Explore course <strong>"Convolutional Neural Networks for Image Classification"</strong> here: <a href="https://stepik.org/course/53801/promo" target=_blank>https://stepik.org/course/53801/promo</a></p>
+<ul>
+  <li>Explore course <strong>"Convolutional Neural Networks for Image Classification"</strong> here: <a href="https://stepik.org/course/53801/promo" target=_blank>https://stepik.org/course/53801/promo</a></li>
+</ul>
 
 <h3 id="reference-to">Reference to:</h3>
 <p>Valentyn N Sichkar. Neural Networks for computer vision in autonomous vehicles and robotics // GitHub platform. DOI: 10.5281/zenodo.1317904</p>