Use sass again

assets/sass/base/base.sass

@@ -0,0 +1,29 @@
+a
+    color: inherit
+    text-decoration: none
+
+    &:focus,
+    &:hover
+      text-decoration: underline
+
+main a
+    text-decoration: underline
+
+    &:focus,
+    &:hover
+        text-decoration: none
+
+h1, h2, h3
+    @apply .mb-2
+
+.content
+    h2,
+    h3
+        @apply .mt-6
+
+p,
+ul,
+ol,
+table,
+pre
+    @apply .mb-4

assets/sass/base/images.sass

@@ -0,0 +1,5 @@
+img.with-border
+    @apply .border .border-solid .border-grey-light
+
+svg
+    fill: currentColor