Add div to collapsible

layouts/shortcodes/collapsible.html

@@ -1,4 +1,6 @@
+<div>
 <button type="button" class="collapsible">{{ index .Params 0 }}</button>
-<div class="content">
-  <p>{{ .Inner }}</p>
+<div class="collapsible-content">
+  {{ .Inner }}
+</div>
 </div>

static/css/custom.css

@@ -75,10 +75,11 @@
 }
 
 /* Style the collapsible content. Note: hidden by default */
-.content {
+.collapsible-content {
   padding: 0 18px;
   display: none;
   overflow: hidden;
   background-color: #f1f1f1;
+  color: black;
 }