Added accordion scss code to the theme

_sass/elixir/_accordion.scss

+.accordion {
+  border-radius: 8px;
+  overflow: hidden;
+  box-shadow: 0 4px 4px -2px rgba(0,0,0,0.5);
+
+  .accordion-item {
+    width: 100%;
+    color: #f3efef;
+    overflow: hidden;
+
+    label {
+      display: flex;
+      padding: 1em;
+      background: #2c3e50;
+      justify-content: space-between;
+      font-weight: bold;
+      cursor: pointer;
+      border-bottom: solid 1px white;
+
+      &:hover {
+        background: #1a252f;
+      }
+
+      &:after {
+        content: "\276F";
+        width: 1em;
+        height: 1em;
+        text-align: center;
+        transition: all .35s;
+      }
+    }
+
+    input {
+      position: absolute;
+      opacity: 0;
+      z-index: -1;
+
+      &:checked + label {
+        background: #1a252f;
+      }
+
+      &:checked + label:after {
+        -webkit-transform: rotate(90deg);
+                transform: rotate(90deg);
+      }
+
+      &:checked ~ .accordion-content {
+        max-height: 100vh;
+        padding: 1em;
+      }
+    }
+
+    .accordion-content {
+      max-height: 0;
+      padding: 0 1em;
+      color: #2c3e50;
+      background: white;
+      transition: all .35s;
+      font-size: larger;
+    }
+  }
+}

elixir-theme.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-elixir-theme"
-  spec.version       = "0.7.1"
+  spec.version       = "0.7.2"
   spec.authors       = ["jacek.lebioda"]
   spec.email         = ["jacek.lebioda@uni.lu"]