adjust index image size to fit

Author: lee1043

tutorials.html

@@ -88,7 +88,7 @@ <h3>VCS</h3>
         <div class="example">
             <a href="Jupyter/Colormap_Tutorial/Colormap_Tutorial.html">
                 <div class="img-wrapper">
-                    <img src="Jupyter/Colormap_Tutorial/Colormap_Tutorial.png">
+                    <img src="Jupyter/Colormap_Tutorial/Colormap_Tutorial.png" height="100" width="100">
                 </div>
                 <p>Colormap tutorial</p>
             </a>