diff --git a/_layouts/base.html b/_layouts/base.html
index 59fa679..2f0db7c 100644
--- a/_layouts/base.html
+++ b/_layouts/base.html
@@ -45,7 +45,7 @@ layout: compress
 	{% endif %}
 
 	<style>body,html,nav{background:#333}nav,nav li,nav li a{display:block}body,html,main,nav li{margin:0;padding:0}main,nav{position:absolute;top:0}body,html{font-size:17px;color:#000}#container{width:100%;max-width:1100px;margin:auto;position:relative}nav{left:0;width:280px;list-style:none;color:#fff}nav li a{padding:5px;color:#ccc;text-decoration:none}main{left:280px;right:0}article{background:#fff;padding:0 20px 20px}</style>
-	<link rel="stylesheet" href="{{ page.root }}/static/style.css?v=3">
+	<link rel="stylesheet" href="{{ page.root }}/static/style.css?v=4">
 </head>
 <body>
 	<div id="container">
diff --git a/_layouts/default.html b/_layouts/default.html
index 41792a4..d6d9995 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -63,6 +63,41 @@ layout: base
 		<li>{% if next %}<a href="{{ page.root }}{{ next.url}}">{{ next.title }} &gt;</a>{% endif %}</li>
 	</ul>
 
+	{% if language == "en" %}
+	<aside class="feedback">
+		<h2>
+			{% unless page.homepage %}Confused?{% endunless %}
+			Have an idea to make the book better?
+		</h2>
+		<p>
+			Please let me know using the form below.
+		</p>
+		<form method="POST" action="https://api.rubenwardy.com/comment/">
+			<input type="hidden" name="url" value="{{ page.url | absolute_url }}">
+			<input type="hidden" name="redirect_to" value="https://rubenwardy.com/minetest_modding_book/comment_recevied.html">
+			<input type="hidden" name="name" value="Anonymous">
+			<label for="username" class="form-label">Username</label>
+			<input type="text" id="username" name="username">
+			<div class="form-group">
+				<label for="message" class="form-label">Mesage</label>
+				<textarea class="form-control" id="message" name="message" rows="3" required="" minlength="5" maxlength="1800"></textarea>
+				<small id="messageHelp" class="form-text text-muted">
+					Max 1800 characters. What is missing? What confused you?
+					What did you find unclear? What other feedback do you have?
+				</small>
+			</div>
+			<div class="form-group">
+				<label for="email" class="form-label">Email address (optional)</label>
+				<input type="email" class="form-control" id="email" name="email" aria-describedby="emailHelp" maxlength="320">
+				<small id="emailHelp" class="form-text text-muted">
+					Optional, if you'd like to receive a response.
+				</small>
+			</div>
+			<button type="submit" class="btn btn-primary">Comment</button>
+		</form>
+	</aside>
+	{% endif %}
+
 	<footer>
 		&copy; 2014-{{ site.time | date: '%Y' }}
 		{% if language == "en" %}
diff --git a/_sass/_feedback.scss b/_sass/_feedback.scss
new file mode 100644
index 0000000..e42d528
--- /dev/null
+++ b/_sass/_feedback.scss
@@ -0,0 +1,121 @@
+.feedback {
+	background: white;
+	padding: 1em;
+
+	input[name='username'], label[for='username'] {
+		display: none;
+	}
+
+	h2 {
+		border: none;
+		margin-top: 0;
+	}
+}
+
+.btn {
+	--color-primary-dark: #007DB8;
+	--color-primary-dark-highlight: #06aed5;
+
+	display: inline-block;
+	padding: 0.375rem 0.75rem;
+	margin: 0.25rem 0.25rem 0.25rem 0;
+	font-size: 0.9375rem;
+	line-height: 1.5;
+	border-radius: 0.25rem;
+	background: transparent;
+	border: 1px solid transparent;
+	color: white;
+	transition: color 0.15s ease-in-out, filter 0.15s ease-in-out,
+		background-color 0.15s ease-in-out, border-color 0.15s ease-in-out,
+		box-shadow 0.15s ease-in-out;
+	cursor: pointer;
+	box-sizing: border-box;
+	text-align: center;
+
+	&:hover {
+		color: white;
+		text-decoration: none;
+		background-color: rgba(255, 255, 255, 0.25);
+	}
+
+	&.active {
+		color: var(--color-primary-dark);
+	}
+
+	img.icon {
+		width: 100%;
+		height: 100%;
+		object-fit: contain;
+	}
+}
+
+.btn-primary {
+	background-color: var(--color-primary-dark);
+	border-color: var(--color-primary-dark);
+
+	&:hover {
+		background-color: var(--color-primary-dark-highlight);
+		border-color: var(--color-primary-dark-highlight);
+	}
+}
+
+.form-group {
+	margin-bottom: 1rem;
+}
+
+button, input {
+	overflow: visible;
+}
+
+input, button, select, optgroup, textarea {
+	margin: 0;
+	font-family: inherit;
+	font-size: inherit;
+	line-height: inherit;
+	box-sizing: border-box;
+}
+
+label {
+	display: inline-block;
+	margin-bottom: 0.5rem;
+}
+
+.form-control {
+	display: block;
+	width: 100%;
+	height: calc(1.5em + 1.5rem + 2px);
+	padding: 0.75rem 1rem;
+	font-size: 0.9375rem;
+	font-weight: 400;
+	line-height: 1.5;
+	color: #52575C;
+	background-color: #fff;
+	background-clip: padding-box;
+	border: 1px solid #ced4da;
+	border-radius: 0.25rem;
+	transition: border-color 0.15s ease-in-out, -webkit-box-shadow 0.15s ease-in-out;
+	transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
+	transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out, -webkit-box-shadow 0.15s ease-in-out;
+}
+
+.text-muted {
+	color: #7A8288 !important;
+}
+.form-text {
+	display: block;
+	margin-top: 0.25rem;
+}
+
+small, .small {
+	font-size: 80%;
+	font-weight: 400;
+}
+
+textarea.form-control {
+	height: auto;
+}
+
+textarea {
+	overflow: auto;
+	resize: vertical;
+}
diff --git a/_sass/_main.scss b/_sass/_main.scss
index d800709..436bc9f 100644
--- a/_sass/_main.scss
+++ b/_sass/_main.scss
@@ -198,3 +198,10 @@ header span {
 		position: relative;
 	}
 }
+
+
+@import "content";
+@import "code";
+@import "notice";
+@import "table";
+@import "feedback";
diff --git a/comment_received.html b/comment_received.html
new file mode 100644
index 0000000..3fa9e25
--- /dev/null
+++ b/comment_received.html
@@ -0,0 +1,29 @@
+---
+title: Thanks for your feedback
+layout: base
+root: .
+sitemap: false
+noindex: true
+---
+
+<main>
+	<article>
+		<h1>Minetest Modding Book</h1>
+
+		<h2>Thanks for sharing your feedback!</h2>
+
+		<p>
+			You're helping to make the modding book better.
+		</p>
+
+		<p>
+			<a href="{{ '/index.html' | relative_url }}">
+				Back to the book
+			</a>
+		</p>
+	</article>
+
+	<footer>
+		&copy; 2014-{{ site.time | date: '%Y' }}
+	</footer>
+</main>
diff --git a/languages.html b/languages.html
index 949b052..c92d7db 100644
--- a/languages.html
+++ b/languages.html
@@ -19,6 +19,6 @@ root: .
 	</article>
 
 	<footer>
-		&copy; 2014-20
+		&copy; 2014-{{ site.time | date: '%Y' }}
 	</footer>
 </main>
diff --git a/static/style.scss b/static/style.scss
index 518d603..9f41894 100644
--- a/static/style.scss
+++ b/static/style.scss
@@ -2,7 +2,3 @@
 ---
 
 @import "main";
-@import "content";
-@import "code";
-@import "notice";
-@import "table";
