diff --git a/alert.html b/alert.html
index 1c433c3..9d79fc2 100644
--- a/alert.html
+++ b/alert.html
@@ -1,7 +1,12 @@
-<html>
-<head><title>Hound</title>
-<link rel="stylesheet"
-			href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+        <title>Hound</title>
+        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"
+              integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M"
+              crossorigin="anonymous">
 <style type="text/css">
 tr.OK th { background-color: #ccffcc; }
 tr.Failed th { background-color: #ffcccc; }
diff --git a/index.html b/index.html
index 252b6cb..ee6b235 100644
--- a/index.html
+++ b/index.html
@@ -1,8 +1,13 @@
-<html>
-<head><title>Hound</title>
-<link rel="stylesheet"
-			href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
-<style type="text/css">
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+        <title>Hound</title>
+        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"
+              integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M"
+              crossorigin="anonymous">
+        <style type="text/css">
 tr.OK th { background-color: #ccffcc; }
 tr.Failed th { background-color: #ffcccc; }
 tr.Error th { background-color: #ffddcc; }
@@ -42,7 +47,7 @@ <h1>Hound</h1>
         </div>
 
     <div class="table-responsive">
-<table class="table table-condensed table-striped">
+<table class="table table-sm table-striped">
 <tr>
 <th>Metric</th>
 <th></th>
