diff --git a/_layouts/default.html b/_layouts/default.html
index 6e09410..f472451 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -44,7 +44,7 @@
     <div class="site-header">
       <a href="{{ '/' | absolute_url }}" class="site-title lh-tight">{% include title.html %}</a>
       <a href="#" id="menu-button" class="site-button">
-        <svg viewBox="0 0 24 24" class="icon"><use xlink:href="#svg-menu"></use></svg>
+	<svg viewBox="0 0 24 24" class="icon" aria-label="Menu"><use xlink:href="#svg-menu"></use></svg>
       </a>
     </div>
     <nav role="navigation" aria-label="Main" id="site-nav" class="site-nav">
@@ -67,7 +67,7 @@
     </nav>
     <footer class="site-footer">
       <!--This site uses <a href="https://github.com/pmarsceill/just-the-docs">Just the Docs</a>, a documentation theme for Jekyll.-->
-		<div class="text-small text-grey-dk-000 mb-4">
+		<div class="text-small text-grey-dk-300 mb-4">
               {% if site.license_image_url != nil %}
                 <img alt="{{ site.license_name }}" style="border-width:0" src="{{ site.license_image_url }}" /><br />
               {% endif %}
@@ -78,7 +78,7 @@
                   {% endif %}
                   {{ site.license_name }}{% if site.license_url != nil %}</a>{% endif %}.</p>
               {% endif %}
-            <img width="170px" style="padding-bottom:15px;" align="middle" src="{{site.baseurl}}/assets/img/logo.png" >
+            <img width="170px" style="padding-bottom:15px;" align="middle" alt="Logo" src="{{site.baseurl}}/assets/img/logo.png" >
             </div>
     </footer>
   </div>
@@ -88,7 +88,7 @@
         <div class="search">
           <div class="search-input-wrap">
             <input type="text" id="search-input" class="search-input" tabindex="0" placeholder="Search {{ site.title }}" aria-label="Search {{ site.title }}" autocomplete="off">
-            <label for="search-input" class="search-label"><svg viewBox="0 0 24 24" class="search-icon"><use xlink:href="#svg-search"></use></svg></label>
+            <label for="search-input" class="search-label" aria-label="Search Icon"><svg viewBox="0 0 24 24" class="search-icon" aria-hidden="true" alt="Search Icon"><use xlink:href="#svg-search"></use></svg></label>
           </div>
           <div id="search-results" class="search-results"></div>
         </div>
@@ -178,7 +178,7 @@ <h2 class="text-delta">Table of contents</h2>
             {% if site.last_edit_timestamp or site.gh_edit_link %}
               <div class="d-flex mt-2">
                 {% if site.last_edit_timestamp and site.last_edit_time_format and page.last_modified_date %}
-                  <p class="text-small text-grey-dk-000 mb-0 mr-2">
+                  <p class="text-small text-grey-dk-300 mb-0 mr-2">
                     Page last modified: <span class="d-inline-block">{{ page.last_modified_date | date: site.last_edit_time_format }}</span>.
                   </p>
                 {% endif %}
@@ -189,7 +189,7 @@ <h2 class="text-delta">Table of contents</h2>
                   site.gh_edit_branch and
                   site.gh_edit_view_mode
                 %}
-                  <p class="text-small text-grey-dk-000 mb-0">
+                  <p class="text-small text-grey-dk-300 mb-0">
                     <a href="{{ site.gh_edit_repository }}/{{ site.gh_edit_view_mode }}/{{ site.gh_edit_branch }}{% if site.gh_edit_source %}/{{ site.gh_edit_source }}{% endif %}/{{ page.path }}" id="edit-this-page">{{ site.gh_edit_link_text }}</a>
                   </p>
                 {% endif %}