Move themes files into the root directory

assets/css/custom.css

@@ -0,0 +1,31 @@
+.epigraph {
+  text-align: right;
+}
+
+table {
+  border-collapse: collapse;
+}
+
+table td, table th {
+  padding: 0 0.25rem;
+}
+
+table th {
+  border-bottom: 1px var(--form-success-bg) solid;
+}
+
+table td {
+  border-bottom: 1px var(--form-success-text) solid;
+}
+
+@media screen and (max-width: 800px) {
+  .site-navigation { /* Override for hard-coded light theme style. */
+    background: rgba(0, 0, 0, 0.9);
+  }
+}
+
+@media screen and (max-width: 800px) {
+  .site-navigation { /* Override for hard-coded light theme style. */
+    background: rgba(0, 0, 0, 0.9);
+  }
+}