diff --git a/book.toml b/book.toml
index f86dcf1..ae70ce0 100644
--- a/book.toml
+++ b/book.toml
@@ -6,3 +6,4 @@ title = "Rayhunter - An IMSI Catcher Catcher"
 
 [output.html]
 edit-url-template = "https://github.com/efforg/rayhunter/edit/main/{path}"
+additional-css = ["doc/custom.css"]
diff --git a/doc/custom.css b/doc/custom.css
new file mode 100644
index 0000000..cd693f3
--- /dev/null
+++ b/doc/custom.css
@@ -0,0 +1,6 @@
+.warning-box {
+    padding: 0.75em 1em;
+    border-left: 4px solid #e33;
+    border-radius: 4px;
+    background-color: color-mix(in srgb, currentColor 10%, transparent);
+}
diff --git a/doc/moxee.md b/doc/moxee.md
index 6935143..e107dc1 100644
--- a/doc/moxee.md
+++ b/doc/moxee.md
@@ -5,7 +5,15 @@ Supported in Rayhunter since version 0.6.0.
 The Moxee Hotspot is a device very similar to the Orbic RC400L. It seems to be
 primarily for the US market.
 
-**These devices are known to become completely bricked by installing Rayhunter.** We're still trying to figure out what's wrong in [this discussion](https://github.com/EFForg/rayhunter/issues/865). We don't recommend buying this device even though it's cheaper than the Orbic right now.
+<div class="warning-box">
+
+**WARNING: These devices are known to become completely bricked by installing Rayhunter.**
+
+Do not buy this device nor try to install _nor upgrade_ Rayhunter on it.
+
+We're still trying to figure out what's wrong in [this discussion](https://github.com/EFForg/rayhunter/issues/865).
+
+</div>
 
 - [KonnectONE product page](https://www.konnectone.com/specs-hotspot)
 - [Moxee product page](https://www.moxee.com/hotspot)