diff --git a/src/css/photon.css b/src/css/photon.css
index 4c3fd4b28..4cb64bc66 100644
--- a/src/css/photon.css
+++ b/src/css/photon.css
@@ -12,6 +12,12 @@
 :root.photon #arc-list tr:nth-of-type(odd) span.quote {
   color: #C0E17A;
 }
+:root.photon.highlight-you .quotesYou$site$highlightable$reply {
+  border-left: 3px solid rgba(221, 0, 0, .8) !important;
+}
+:root.photon.highlight-own .yourPost$site$highlightable$reply {
+  border-left: 3px dashed rgba(221, 0, 0, .8) !important;
+}
 
 /* Header */
 :root.photon #header-bar.dialog {
diff --git a/src/css/spooky.css b/src/css/spooky.css
index 874d22c7e..7211d6a52 100644
--- a/src/css/spooky.css
+++ b/src/css/spooky.css
@@ -12,6 +12,12 @@
 :root.spooky #arc-list span.quote {
   color: #634C2C;
 }
+:root.spooky.highlight-you .quotesYou$site$highlightable$reply {
+  border-left: 3px solid rgba(145, 182, 214, .8) !important;
+}
+:root.spooky.highlight-own .yourPost$site$highlightable$reply {
+  border-left: 3px dashed rgba(145, 182, 214, .8) !important;
+}
 
 /* Header */
 :root.spooky #header-bar.dialog {
diff --git a/src/css/tomorrow.css b/src/css/tomorrow.css
index 0a561ed97..e3ce82ddd 100644
--- a/src/css/tomorrow.css
+++ b/src/css/tomorrow.css
@@ -8,6 +8,12 @@
 :root.tomorrow #arc-list span.quote {
   color: #B5BD68;
 }
+:root.tomorrow.highlight-you .quotesYou$site$highlightable$reply {
+  border-left: 3px solid rgba(145, 182, 214, .8) !important;
+}
+:root.tomorrow.highlight-own .yourPost$site$highlightable$reply {
+  border-left: 3px dashed rgba(145, 182, 214, .8) !important;
+}
 
 /* Header */
 :root.tomorrow #header-bar.dialog {
diff --git a/src/css/yotsuba-b.css b/src/css/yotsuba-b.css
index abfafa5f7..b04f9246c 100644
--- a/src/css/yotsuba-b.css
+++ b/src/css/yotsuba-b.css
@@ -8,6 +8,14 @@
   border-color: #98E;
 }
 
+/* 4chan style fixes */
+:root.yotsuba-b.highlight-you .quotesYou$site$highlightable$reply {
+  border-left: 3px solid rgba(221, 0, 0, .8) !important;
+}
+:root.yotsuba-b.highlight-own .yourPost$site$highlightable$reply {
+  border-left: 3px dashed rgba(221, 0, 0, .8) !important;
+}
+
 /* Header */
 :root.yotsuba-b #header-bar.dialog {
   background-color: rgba(214,218,240,0.98);
diff --git a/src/css/yotsuba.css b/src/css/yotsuba.css
index 7ed23a580..ea8b8d799 100644
--- a/src/css/yotsuba.css
+++ b/src/css/yotsuba.css
@@ -8,6 +8,14 @@
   border-color: #EA8;
 }
 
+/* 4chan style fixes */
+:root.yotsuba.highlight-you .quotesYou$site$highlightable$reply {
+  border-left: 3px solid rgba(221, 0, 0, .8) !important;
+}
+:root.yotsuba.highlight-own .yourPost$site$highlightable$reply {
+  border-left: 3px dashed rgba(221, 0, 0, .8) !important;
+}
+
 /* Header */
 :root.yotsuba #header-bar.dialog {
   background-color: rgba(240,224,214,0.98);