diff --git a/css/pesticide.css b/css/pesticide.css
index ff1e3e9..2bf4554 100644
--- a/css/pesticide.css
+++ b/css/pesticide.css
@@ -198,4 +198,8 @@ br
   outline: 1px solid #db687d !important;
 wbr
   outline: 1px solid #db175b !important;
+:before
+  outline: 1px solid #2980b9 !important;
+:after
+  outline: 1px solid #2980b9 !important;
 }
diff --git a/less/pesticide.less b/less/pesticide.less
index ecb7457..9b8db83 100644
--- a/less/pesticide.less
+++ b/less/pesticide.less
@@ -105,6 +105,8 @@
 	span { outline: 1px solid #cc2643 !important; }
 	br { outline: 1px solid #db687d !important; }
 	wbr { outline: 1px solid #db175b !important; }
+	:before { outline: 1px solid #2980b9 !important; }
+	:after { outline: 1px solid #2980b9 !important; }
 }
 
 & when (@pesticide-debug-depth = true) {
diff --git a/sass/pesticide.scss b/sass/pesticide.scss
index cd8697e..e421400 100644
--- a/sass/pesticide.scss
+++ b/sass/pesticide.scss
@@ -105,6 +105,8 @@ $pesticide-debug-depth: true !default;
   span { outline: 1px solid #cc2643 !important; }
   br { outline: 1px solid #db687d !important; }
   wbr { outline: 1px solid #db175b !important; }
+  :before { outline: 1px solid #2980b9 !important; }
+  :after { outline: 1px solid #2980b9 !important; }
 }
 
 @if $pesticide-debug-depth == true {
diff --git a/stylus/pesticide.styl b/stylus/pesticide.styl
index 08b84c9..985908f 100644
--- a/stylus/pesticide.styl
+++ b/stylus/pesticide.styl
@@ -203,3 +203,7 @@ if pesticide-debug-outline
 		outline 1px solid #db687d !important
   wbr
 		outline 1px solid #db175b !important
+  :before
+		outline: 1px solid #2980b9 !important;
+  :after
+		outline: 1px solid #2980b9 !important;