diff --git a/observable/observablehq.config.ts b/observable/observablehq.config.ts
index a7527e5..9f89f3e 100644
--- a/observable/observablehq.config.ts
+++ b/observable/observablehq.config.ts
@@ -19,7 +19,7 @@ export default {
   // ],
 
   // Some additional configuration options and their defaults:
-  theme: "slate", // try "light", "dark", "slate", etc.
+  // theme: "light", // try "light", "dark", "slate", etc.
   // header: "", // what to show in the header (HTML)
   footer: "", // what to show in the footer (HTML)
   // toc: true, // whether to show the table of contents
diff --git a/observable/src/observatoire.css b/observable/src/observatoire.css
index 08a8284..c1b2398 100644
--- a/observable/src/observatoire.css
+++ b/observable/src/observatoire.css
@@ -1,5 +1,15 @@
 @import url("observablehq:default.css");
-@import url("observablehq:theme-slate.css");
+@import url("observablehq:theme-air.css");
+
+:root {
+  --theme-foreground: rgb(33, 37, 41);
+}
+
+body,
+button,
+.card {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Ubuntu, "Noto Sans", Arial, "Odoo Unicode Support Noto", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+}
 
 p,
 table,