Add functioning site-wide dark mode

static/css/custom.css

@@ -0,0 +1,55 @@
+/** Link decoration */
+* .site-title a {
+    color: #898989;
+    text-decoration: none;
+}
+
+* .site-title a:hover {
+    color: #5F5F5F;
+    text-decoration: none;
+}
+
+* article h2 a {
+    color: #5F5F5F;
+    text-decoration: none;
+}
+
+* article h2 a:hover {
+    color: #5F5F5F;
+    text-decoration: none;
+}
+
+/** Post title colours */
+.post-title {
+    color: #5F5F5F;
+}
+
+/** Tag Link colours */
+.tag {
+    color: #898989;
+}
+
+.tag:hover {
+    color: #5F5F5F;
+}
+
+/** Icons */
+.inline-svg {
+    display: inline-block;
+    height: 1rem;
+    width: 1rem;
+    position: relative;
+}
+
+/** Dark Mode */
+.dark-mode {
+    background-color: black;
+    color: white;
+}
+
+.dark-mode * h2 a {
+    text-shadow: none;
+    box-shadow: none;
+    color: white;
+}
+