diff --git a/_sources/index.rst.txt b/_sources/index.rst.txt
index b2a4b0b..b702121 100644
--- a/_sources/index.rst.txt
+++ b/_sources/index.rst.txt
@@ -29,14 +29,14 @@ progress in electrochemical research and development.
     .. grid-item-card::
         :link: about.html
 
-        :octicon:`report;1em;sd-text-info` Quick Start
+        :octicon:`rocket;1em;sd-text-info` Quick Start
         ^^^^^^^^^^^
         Let's go! Here is some information to help you get started
 
     .. grid-item-card::
         :link: electrochemistry.html
 
-        Class Index
+        :octicon:`book;1em;sd-text-info` Class Index
         ^^^^^^^^^^^
         A complete list of terms and some human-readable annotations
 
@@ -45,13 +45,13 @@ progress in electrochemical research and development.
     .. grid-item-card::
         :link: examples.html
 
-        Examples
+        :octicon:`pencil;1em;sd-text-info` Examples
         ^^^^^^^^
         Here are some examples that demonstrate basic usage of the ontology
 
     .. grid-item-card::
         :link: contribute.html
 
-        Contribute
+        :octicon:`thumbsup;1em;sd-text-info` Contribute
         ^^^^^^^^^^
         Help us develop the ontology by following these guidelines
\ No newline at end of file
diff --git a/index.html b/index.html
index 82359cd..4fe6a6e 100644
--- a/index.html
+++ b/index.html
@@ -349,7 +349,7 @@ <h1>Electrochemistry Domain Ontology<a class="headerlink" href="#electrochemistr
 <div class="sd-col sd-d-flex-row docutils">
 <div class="sd-card sd-sphinx-override sd-w-100 sd-shadow-sm sd-card-hover docutils">
 <div class="sd-card-header docutils">
-<p class="sd-card-text"><svg version="1.1" width="1.0em" height="1.0em" class="sd-octicon sd-octicon-report sd-text-info" viewBox="0 0 16 16" aria-hidden="true"><path fill-rule="evenodd" d="M1.75 1.5a.25.25 0 00-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 01.75.75v2.19l2.72-2.72a.75.75 0 01.53-.22h6.5a.25.25 0 00.25-.25v-9.5a.25.25 0 00-.25-.25H1.75zM0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0114.25 13H8.06l-2.573 2.573A1.457 1.457 0 013 14.543V13H1.75A1.75 1.75 0 010 11.25v-9.5zM9 9a1 1 0 11-2 0 1 1 0 012 0zm-.25-5.25a.75.75 0 00-1.5 0v2.5a.75.75 0 001.5 0v-2.5z"></path></svg> Quick Start</p>
+<p class="sd-card-text"><svg version="1.1" width="1.0em" height="1.0em" class="sd-octicon sd-octicon-rocket sd-text-info" viewBox="0 0 16 16" aria-hidden="true"><path fill-rule="evenodd" d="M14.064 0a8.75 8.75 0 00-6.187 2.563l-.459.458c-.314.314-.616.641-.904.979H3.31a1.75 1.75 0 00-1.49.833L.11 7.607a.75.75 0 00.418 1.11l3.102.954c.037.051.079.1.124.145l2.429 2.428c.046.046.094.088.145.125l.954 3.102a.75.75 0 001.11.418l2.774-1.707a1.75 1.75 0 00.833-1.49V9.485c.338-.288.665-.59.979-.904l.458-.459A8.75 8.75 0 0016 1.936V1.75A1.75 1.75 0 0014.25 0h-.186zM10.5 10.625c-.088.06-.177.118-.266.175l-2.35 1.521.548 1.783 1.949-1.2a.25.25 0 00.119-.213v-2.066zM3.678 8.116L5.2 5.766c.058-.09.117-.178.176-.266H3.309a.25.25 0 00-.213.119l-1.2 1.95 1.782.547zm5.26-4.493A7.25 7.25 0 0114.063 1.5h.186a.25.25 0 01.25.25v.186a7.25 7.25 0 01-2.123 5.127l-.459.458a15.21 15.21 0 01-2.499 2.02l-2.317 1.5-2.143-2.143 1.5-2.317a15.25 15.25 0 012.02-2.5l.458-.458h.002zM12 5a1 1 0 11-2 0 1 1 0 012 0zm-8.44 9.56a1.5 1.5 0 10-2.12-2.12c-.734.73-1.047 2.332-1.15 3.003a.23.23 0 00.265.265c.671-.103 2.273-.416 3.005-1.148z"></path></svg> Quick Start</p>
 </div>
 <div class="sd-card-body docutils">
 <p class="sd-card-text">Let’s go! Here is some information to help you get started</p>
@@ -359,7 +359,7 @@ <h1>Electrochemistry Domain Ontology<a class="headerlink" href="#electrochemistr
 <div class="sd-col sd-d-flex-row docutils">
 <div class="sd-card sd-sphinx-override sd-w-100 sd-shadow-sm sd-card-hover docutils">
 <div class="sd-card-header docutils">
-<p class="sd-card-text">Class Index</p>
+<p class="sd-card-text"><svg version="1.1" width="1.0em" height="1.0em" class="sd-octicon sd-octicon-book sd-text-info" viewBox="0 0 16 16" aria-hidden="true"><path fill-rule="evenodd" d="M0 1.75A.75.75 0 01.75 1h4.253c1.227 0 2.317.59 3 1.501A3.744 3.744 0 0111.006 1h4.245a.75.75 0 01.75.75v10.5a.75.75 0 01-.75.75h-4.507a2.25 2.25 0 00-1.591.659l-.622.621a.75.75 0 01-1.06 0l-.622-.621A2.25 2.25 0 005.258 13H.75a.75.75 0 01-.75-.75V1.75zm8.755 3a2.25 2.25 0 012.25-2.25H14.5v9h-3.757c-.71 0-1.4.201-1.992.572l.004-7.322zm-1.504 7.324l.004-5.073-.002-2.253A2.25 2.25 0 005.003 2.5H1.5v9h3.757a3.75 3.75 0 011.994.574z"></path></svg> Class Index</p>
 </div>
 <div class="sd-card-body docutils">
 <p class="sd-card-text">A complete list of terms and some human-readable annotations</p>
@@ -373,7 +373,7 @@ <h1>Electrochemistry Domain Ontology<a class="headerlink" href="#electrochemistr
 <div class="sd-col sd-d-flex-row docutils">
 <div class="sd-card sd-sphinx-override sd-w-100 sd-shadow-sm sd-card-hover docutils">
 <div class="sd-card-header docutils">
-<p class="sd-card-text">Examples</p>
+<p class="sd-card-text"><svg version="1.1" width="1.0em" height="1.0em" class="sd-octicon sd-octicon-pencil sd-text-info" viewBox="0 0 16 16" aria-hidden="true"><path fill-rule="evenodd" d="M11.013 1.427a1.75 1.75 0 012.474 0l1.086 1.086a1.75 1.75 0 010 2.474l-8.61 8.61c-.21.21-.47.364-.756.445l-3.251.93a.75.75 0 01-.927-.928l.929-3.25a1.75 1.75 0 01.445-.758l8.61-8.61zm1.414 1.06a.25.25 0 00-.354 0L10.811 3.75l1.439 1.44 1.263-1.263a.25.25 0 000-.354l-1.086-1.086zM11.189 6.25L9.75 4.81l-6.286 6.287a.25.25 0 00-.064.108l-.558 1.953 1.953-.558a.249.249 0 00.108-.064l6.286-6.286z"></path></svg> Examples</p>
 </div>
 <div class="sd-card-body docutils">
 <p class="sd-card-text">Here are some examples that demonstrate basic usage of the ontology</p>
@@ -383,7 +383,7 @@ <h1>Electrochemistry Domain Ontology<a class="headerlink" href="#electrochemistr
 <div class="sd-col sd-d-flex-row docutils">
 <div class="sd-card sd-sphinx-override sd-w-100 sd-shadow-sm sd-card-hover docutils">
 <div class="sd-card-header docutils">
-<p class="sd-card-text">Contribute</p>
+<p class="sd-card-text"><svg version="1.1" width="1.0em" height="1.0em" class="sd-octicon sd-octicon-thumbsup sd-text-info" viewBox="0 0 16 16" aria-hidden="true"><path fill-rule="evenodd" d="M8.834.066C7.494-.087 6.5 1.048 6.5 2.25v.5c0 1.329-.647 2.124-1.318 2.614-.328.24-.66.403-.918.508A1.75 1.75 0 002.75 5h-1A1.75 1.75 0 000 6.75v7.5C0 15.216.784 16 1.75 16h1a1.75 1.75 0 001.662-1.201c.525.075 1.067.229 1.725.415.152.043.31.088.475.133 1.154.32 2.54.653 4.388.653 1.706 0 2.97-.153 3.722-1.14.353-.463.537-1.042.668-1.672.118-.56.208-1.243.313-2.033l.04-.306c.25-1.869.265-3.318-.188-4.316a2.418 2.418 0 00-1.137-1.2C13.924 5.085 13.353 5 12.75 5h-1.422l.015-.113c.07-.518.157-1.17.157-1.637 0-.922-.151-1.719-.656-2.3-.51-.589-1.247-.797-2.01-.884zM4.5 13.3c.705.088 1.39.284 2.072.478l.441.125c1.096.305 2.334.598 3.987.598 1.794 0 2.28-.223 2.528-.549.147-.193.276-.505.394-1.07.105-.502.188-1.124.295-1.93l.04-.3c.25-1.882.189-2.933-.068-3.497a.922.922 0 00-.442-.48c-.208-.104-.52-.174-.997-.174H11c-.686 0-1.295-.577-1.206-1.336.023-.192.05-.39.076-.586.065-.488.13-.97.13-1.328 0-.809-.144-1.15-.288-1.316-.137-.158-.402-.304-1.048-.378C8.357 1.521 8 1.793 8 2.25v.5c0 1.922-.978 3.128-1.933 3.825a5.861 5.861 0 01-1.567.81V13.3zM2.75 6.5a.25.25 0 01.25.25v7.5a.25.25 0 01-.25.25h-1a.25.25 0 01-.25-.25v-7.5a.25.25 0 01.25-.25h1z"></path></svg> Contribute</p>
 </div>
 <div class="sd-card-body docutils">
 <p class="sd-card-text">Help us develop the ontology by following these guidelines</p>