diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index 3342e38..6320649 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -17,10 +17,10 @@
         {{ $featuredImage := .Resources.GetMatch (.Params.featured_image.src | safeURL)  }}
         {{ if $featuredImage }}
             {{ $featuredImage = $featuredImage.Resize "600x" }}
-            <figure>
-                <img alt="" src="{{ $featuredImage.RelPermalink }}" />
+            <figure class="figure">
+                <img class="figure-img img-fluid" alt="" src="{{ $featuredImage.RelPermalink }}" />
                 {{ with .Params.featured_image.caption }}
-            <figcaption>{{ . }}</figcaption>
+                <figcaption class="figure-caption">{{ . }}</figcaption>
                 {{ end }}
             </figure>
         {{ end }}
diff --git a/layouts/shortcodes/fig-img.html b/layouts/shortcodes/fig-img.html
index b59bada..805488e 100644
--- a/layouts/shortcodes/fig-img.html
+++ b/layouts/shortcodes/fig-img.html
@@ -1,4 +1,4 @@
-<figure class="fig-img {{ with .Get "class" }}{{ . }}{{ end }}">
+<figure class="figure fig-img {{ with .Get "class" }}{{ . }}{{ end }}">
     {{- if .Get "link" -}}
         <a href="{{ .Get "link" }}"{{ with .Get "target" }} target="{{ . }}"{{ end }}{{ with .Get "rel" }} rel="{{ . }}"{{ end }}>
     {{- end -}}
@@ -9,10 +9,11 @@
          {{- if or (.Get "alt") (.Get "caption") }}
          alt="{{ with .Get "alt" }}{{ . }}{{ else }}{{ .Get "caption" | markdownify| plainify }}{{ end }}"
          {{- end -}}
+         class="figure-img img-fluid rounded"
     /><!-- Closing img tag -->
     {{- if .Get "link" }}</a>{{ end -}}
     {{- if or (or (.Get "title") (.Get "caption")) (.Get "attr") -}}
-        <figcaption>
+        <figcaption class="figure-caption">
             {{ with (.Get "title") -}}
                 <h4>{{ . }}</h4>
             {{- end -}}