Fixes odd looking css in image module (publiclab#8474)

* init

* addressed review comments

Author: Sagarpreet

app/views/editor/rich.html.erb

@@ -38,6 +38,11 @@
   button:hover i.fa-map-marker {
     color: inherit;
   }
+
+  .ple-image_module_guide {
+    flex: 0 0 25%;
+    max-width: 25%;
+  }
 </style>
 
 <div class="pl-editor">
@@ -79,7 +84,7 @@
 
     <!-- main_image module -->
     <div class="ple-module-main_image ple-module container">
-      <div class="ple-module-guide col-md-3"><h2>2</h2></div>
+      <div class="ple-module-guide ple-image_module_guide" ><h2>2</h2></div>
 
       <div class="module-mainImage ple-module-content col-md-9 container">
         <div class="mainImageBox">