diff --git a/src/lib/webengine/webpage.cpp b/src/lib/webengine/webpage.cpp
--- a/src/lib/webengine/webpage.cpp
+++ b/src/lib/webengine/webpage.cpp
@@ -83,6 +83,8 @@
     QWebChannel *channel = new QWebChannel(this);
     ExternalJsObject::setupWebChannel(channel, this);
     setWebChannel(channel, SafeJsWorld);
+    // Prevents white flashes.
+    setBackgroundColor(Qt::transparent);
 
     connect(this, &QWebEnginePage::loadProgress, this, &WebPage::progress);
     connect(this, &QWebEnginePage::loadFinished, this, &WebPage::finished);
diff --git a/themes/chrome/main.css b/themes/chrome/main.css
--- a/themes/chrome/main.css
+++ b/themes/chrome/main.css
@@ -345,9 +345,3 @@
     border-top: 0px;
     background-color: #f3f3f3;
 }
-
-/*WebView*/
-WebView
-{
-    background: white;
-}
diff --git a/themes/linux/main.css b/themes/linux/main.css
--- a/themes/linux/main.css
+++ b/themes/linux/main.css
@@ -278,9 +278,3 @@
     border-top: 0px;
     background-color: #f3f3f3;
 }
-
-/*WebView*/
-WebView
-{
-    background: white;
-}
diff --git a/themes/mac/main.css b/themes/mac/main.css
--- a/themes/mac/main.css
+++ b/themes/mac/main.css
@@ -349,9 +349,3 @@
     border-top: 0px;
     background-color: #f3f3f3;
 }
-
-/*WebView*/
-WebView
-{
-    background: white;
-}
diff --git a/themes/windows/main.css b/themes/windows/main.css
--- a/themes/windows/main.css
+++ b/themes/windows/main.css
@@ -436,9 +436,3 @@
     border-top: 0px;
     background-color: #f3f3f3;
 }
-
-/*WebView*/
-WebView
-{
-    background: white;
-}