diff --git a/assets/css/src/box.styl b/assets/css/src/box.styl
index 0932c6e852..e357f2976c 100644
--- a/assets/css/src/box.styl
+++ b/assets/css/src/box.styl
@@ -199,7 +199,6 @@ $box-description-font-size = $box-description-line-height
   background-image: url('data:image/svg+xml;base64,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')
 
 .mailpoet_boxes_preview
-  margin: -10px
   padding: 10px 20px
 
 .mailpoet_boxes
diff --git a/assets/css/src/modal.styl b/assets/css/src/modal.styl
index 9751588920..acb6250f97 100644
--- a/assets/css/src/modal.styl
+++ b/assets/css/src/modal.styl
@@ -83,6 +83,7 @@ body.mailpoet_modal_opened
 
 .mailpoet_popup_body
   flex-grow: 1
+  position: relative
   margin-top: 20px
 
   .button + .button
diff --git a/assets/css/src/newsletter_editor/components/sidebar.styl b/assets/css/src/newsletter_editor/components/sidebar.styl
index cc28a88398..b596c48a91 100644
--- a/assets/css/src/newsletter_editor/components/sidebar.styl
+++ b/assets/css/src/newsletter_editor/components/sidebar.styl
@@ -128,7 +128,15 @@ $widget-icon-width = 30px
       display: none
 
 /* Browser preview modal */
+.mailpoet_browser_preview_wrapper
+  position: absolute
+  width: 100%
+  height: 100%
+  display: flex
+  flex-direction: column
+
 .mailpoet_browser_preview_toggle
+  flex: 0 1 auto
   height: 30px
   padding: 10px 0
   text-align: center
@@ -138,14 +146,11 @@ $widget-icon-width = 30px
   margin: 0 5px
 
 .mailpoet_browser_preview_container
-  margin: auto
-  height: calc(100% - 60px)
+  flex: 1 1 auto
+  position: relative
+  margin: 15px auto auto auto
   transition: width 0.5s
-  border: 20px solid white
-  border-radius: 20px
   box-sizing: border-box
-  background: white
-  padding: 15px 0
 
 .mailpoet_browser_preview_container_desktop
   width: 100%
@@ -154,4 +159,5 @@ $widget-icon-width = 30px
   width: 350px
 
 .mailpoet_browser_preview_iframe
+  box-sizing: border-box
   border: 1px solid #c3c3c3
diff --git a/assets/js/src/newsletter_editor/components/sidebar.js b/assets/js/src/newsletter_editor/components/sidebar.js
index eea0319406..6bd059bc9e 100644
--- a/assets/js/src/newsletter_editor/components/sidebar.js
+++ b/assets/js/src/newsletter_editor/components/sidebar.js
@@ -270,7 +270,6 @@ define([
         });
 
         this.previewView.render();
-        this.previewView.$el.css('height', '100%');
 
         MailPoet.Modal.popup({
           template: '',
@@ -351,6 +350,7 @@ define([
   });
 
   Module.NewsletterPreviewView = Marionette.View.extend({
+    className: 'mailpoet_browser_preview_wrapper',
     getTemplate: function () { return window.templates.newsletterPreview; },
     events: function () {
       return {