cannot see collapse

.idea/vcs.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/my-htmaa-2018" vcs="Git" />
   </component>
 </project>
\ No newline at end of file

.idea/workspace.xml

@@ -164,7 +164,7 @@
   </component>
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="last_opened_file_path" value="G:/rheometer-cover" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
     <property name="nodejs_npm_path_reset_for_default_project" value="true" />
     <property name="settings.editor.selected.configurable" value="preferences.pluginManager" />

index.html

@@ -134,7 +134,7 @@
     </div>
 
     <!-- RESEARCH-->
-    <div id="research" class="collapse">
+    <div id="research" class="">
         <div class="card card-body bg-success text-white py-5">
             <h2>My Research Interests</h2>
             <p class="lead">Lorem ipsum dolor, sit amet consectetur adipisicing elit. Nihil, ut!</p>