Update modal styles to fill larger screens

Author: jackycute

public/views/help-modal.ejs

@@ -38,7 +38,7 @@
                             <div class="panel-heading">
                                 <h3 class="panel-title">Cheatsheet</h3>
                             </div>
-                            <div class="panel-body" style="max-height: 470px; overflow: auto;">
+                            <div class="panel-body" style="height: calc(100vh - 215px); overflow: auto;">
                                 <table class="table table-condensed">
                                     <thead>
                                         <tr>