Added initial version.

css/002-big-image.css

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+.big-image picture, .big-image img {
+    height: auto;
+    min-height: 100%;
+    min-width: 100%;
+    position: fixed;
+    top: 0;
+    left: 0;
+    z-index: -1;
+}

css/003-gallery.css

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+.gallery-images {
+    display: none;
+}
+
+@media only screen and (min-width: 1280px) {
+    .gallery-images {
+        display: flex;
+        flex-direction: row;
+        align-items: center;
+        justify-content: center;
+        position: fixed;
+        bottom: 0;
+        width: 100%;
+        height: 120px;
+        overflow-x: auto;
+        overflow-y: hidden;
+        z-index: 10;
+    }
+
+    .gallery-images picture, .gallery-images img {
+        height: inherit;
+        margin: 0 1em;
+    }
+
+    .gallery-images picture:hover {
+        cursor: pointer;
+    }
+}