diff --git a/server.py b/server.py
index 59abcdc..04423dd 100644
--- a/server.py
+++ b/server.py
@@ -749,28 +749,36 @@ def index():
     alerts = []
     warnings = []
     for node in node_status:
+        node["class"] = "normal"
         if not node["plain_dns"]:
+            node["class"] = "error"
             alerts.append(f"{node['name']} does not support plain DNS")
 
         if not node["doh"]:
+            node["class"] = "error"
             alerts.append(f"{node['name']} does not support DoH")
 
         if not node["dot"]:
+            node["class"] = "error"
             alerts.append(f"{node['name']} does not support DoT")
 
         if not node["cert"]["valid"]:
+            node["class"] = "error"
             alerts.append(f"{node['name']} has an invalid certificate")
 
         if not node["cert_853"]["valid"]:
+            node["class"] = "error"
             alerts.append(f"{node['name']} has an invalid certificate on port 853")
 
         cert_expiry = datetime.strptime(
             node["cert"]["expiry_date"], "%b %d %H:%M:%S %Y GMT"
         )
         if cert_expiry < datetime.now():
+            node["class"] = "error"
             alerts.append(f"The {node['name']} node's certificate has expired")
             continue
         elif cert_expiry < datetime.now() + relativedelta.relativedelta(days=7):
+            node["class"] = "warning"
             warnings.append(
                 f"The {node['name']} node's certificate is expiring {format_relative_time(cert_expiry)}"
             )
@@ -779,11 +787,13 @@ def index():
             node["cert_853"]["expiry_date"], "%b %d %H:%M:%S %Y GMT"
         )
         if cert_853_expiry < datetime.now():
+            node["class"] = "error"
             alerts.append(
                 f"The {node['name']} node's certificate has expired for DNS over TLS (port 853)"
             )
             continue
         elif cert_853_expiry < datetime.now() + relativedelta.relativedelta(days=7):
+            node["class"] = "warning"
             warnings.append(
                 f"The {node['name']} node's certificate is expiring {format_relative_time(cert_853_expiry)} for DNS over TLS (port 853)"
             )
diff --git a/templates/assets/css/index.css b/templates/assets/css/index.css
index 41bd3c3..6203a8e 100644
--- a/templates/assets/css/index.css
+++ b/templates/assets/css/index.css
@@ -21,4 +21,10 @@
 }
 .node-info > p{
     margin: 0;
-}
\ No newline at end of file
+}
+.node.warning {
+    border-color: #FFA500;
+}
+.node.error {
+    border-color: #FF0000;
+}
diff --git a/templates/index.html b/templates/index.html
index f97aa32..0a1aadc 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -97,7 +97,7 @@
         </div>
         <div class="spacer"></div>
         {% for node in nodes %}
-        <div class="node">
+        <div class="node {{node.class}}">
             <div>
                 <h2>{{node.location}}</h2>
             </div>