add css code chunks

src/lib/Layercake/AxisX.docs.md

@@ -7,6 +7,40 @@ Furthermore, while Layercake components are often externally updated, this axis
 
 Layercake axes must be built inside a Layercake component and context, and, further, within an Svg component. Both can be imported from the layercake package. The Layercake object must be passed flat array (not object) data and domain before anything can be initialized and rendered, and these are used across all components used to craft a chart.
 
+## Want to update axis style straight from the Layercake repo?
+Use this css instead: 
+
+```js
+<style>
+     .tick {
+      font-size: 12px;
+      font-weight: 400;
+      font-family: var(--font-family-sans-serif);
+    }
+    line,
+    .tick line {
+      stroke: #DEDDDD;
+    }
+    .tick text {
+      fill: #000000;
+    }
+    .tick .tick-mark,
+    .baseline {
+      stroke: #000000;
+    }
+    /* This looks slightly better */
+    .axis.snapTicks .tick:last-child text {
+      transform: translateX(3px);
+    }
+    .axis.snapTicks .tick.tick-0 text {
+      transform: translateX(-3px);
+    }
+    .axis-label {
+      font-size: 12px;
+    }
+</style>
+```
+
 
 ```js
 import { AxisX } from "@urbaninstitute/dataviz-components";

src/lib/Layercake/AxisY.docs.md

@@ -7,6 +7,24 @@ Furthermore, while Layercake components are often externally updated, this axis
 
 Layercake axes must be built inside a Layercake component and context, and, further, within an Svg component. Both can be imported from the layercake package. The Layercake object must be passed flat array (not object) data and domain before anything can be initialized and rendered, and these are used across all components used to craft a chart.
 
+## Want to update axis style straight from the Layercake repo?
+Use this css instead: 
+```js
+<style>
+    .tick, .axis-label {
+      font-size: 12px;
+      font-family: var(--font-family-sans-serif);
+    }
+
+    .tick line {
+      stroke: #dedddd;
+    }
+    .tick:first-of-type line {
+      stroke: #000000;
+    }
+</style>
+```
+
 
 ```js
 import { AxisY } from "@urbaninstitute/dataviz-components";