mount expand button on inline body images

src/assets/scss/app.scss

@@ -6,6 +6,7 @@
 
 @import 'base/bootstrap-overrides';
 @import 'classes/nodes-grid';
+@import 'classes/img-wrapper';
 @import 'classes/misc';
 
 @import 'fonts/noto-sans';

src/assets/scss/classes/_img-wrapper.scss

@@ -0,0 +1,42 @@
+.node-view-img-wrapper {
+  display: inline-block;
+  position: relative;
+
+  &:not(:hover) .btn-expand {
+    display: none;
+  }
+
+  .btn-expand {
+    position: absolute;
+    top: 0;
+    right: 0;
+
+    padding: 0;
+    width: 75px;
+    height: 70px;
+    border: 0;
+    border-radius: 0 !important;
+    line-height: 0;
+
+    &:hover,
+    &:focus {
+      path {
+        stroke: $black;
+      }
+    }
+
+    svg {
+      width: 100%;
+      height: 100%;
+      pointer-events: none;
+    }
+
+    path {
+      fill: none;
+      stroke: lighten($black, 20%);
+      stroke-width: 4px;
+      stroke-linejoin: round;
+      stroke-linecap: round;
+    }
+  }
+}