diff --git a/src/css/burichan.css b/src/css/burichan.css
index 8f1a20891..66e1d732e 100644
--- a/src/css/burichan.css
+++ b/src/css/burichan.css
@@ -33,6 +33,8 @@
 /* Catalog */
 :root.burichan .catalog-thread:hover > * {
   background-color: #D6DAF0;
+}
+:root.burichan .catalog-thread:not(:hover), :root.burichan .catalog-thread:hover > * {
   border-color: #B7C5D9;
 }
 
diff --git a/src/css/futaba.css b/src/css/futaba.css
index 355a5bad7..fa170c5ea 100644
--- a/src/css/futaba.css
+++ b/src/css/futaba.css
@@ -33,6 +33,8 @@
 /* Catalog */
 :root.futaba .catalog-thread:hover > * {
   background-color: #F0E0D6;
+}
+:root.futaba .catalog-thread:not(:hover), :root.futaba .catalog-thread:hover > * {
   border-color: #D9BFB7;
 }
 
diff --git a/src/css/photon.css b/src/css/photon.css
index c2effe060..37bb04dbb 100644
--- a/src/css/photon.css
+++ b/src/css/photon.css
@@ -33,6 +33,8 @@
 /* Catalog */
 :root.photon .catalog-thread:hover > * {
   background-color: #DDD;
+}
+:root.photon .catalog-thread:not(:hover), :root.photon .catalog-thread:hover > * {
   border-color: #CCC;
 }
 :root.photon .catalog-code {
diff --git a/src/css/style.css b/src/css/style.css
index cdb6aa7ff..e742fac5f 100644
--- a/src/css/style.css
+++ b/src/css/style.css
@@ -714,7 +714,8 @@ div[data-checked="false"] > .suboption-list {
 }
 .catalog-thread {
   display: inline-block;
-  margin: 0 2px 5px;
+  margin: 1px;
+  border: 1px solid transparent;
   word-wrap: break-word;
   vertical-align: top;
   position: relative;
diff --git a/src/css/tomorrow.css b/src/css/tomorrow.css
index 2f04954e1..8cb996dbd 100644
--- a/src/css/tomorrow.css
+++ b/src/css/tomorrow.css
@@ -32,6 +32,8 @@
 /* Catalog */
 :root.tomorrow .catalog-thread:hover > * {
   background-color: #282A2E;
+}
+:root.tomorrow .catalog-thread:not(:hover), :root.tomorrow .catalog-thread:hover > * {
   border-color: #111;
 }
 :root.tomorrow .catalog-code {
diff --git a/src/css/yotsuba-b.css b/src/css/yotsuba-b.css
index 00989cd62..870f37fde 100644
--- a/src/css/yotsuba-b.css
+++ b/src/css/yotsuba-b.css
@@ -33,6 +33,8 @@
 /* Catalog */
 :root.yotsuba-b .catalog-thread:hover > * {
   background-color: #D6DAF0;
+}
+:root.yotsuba-b .catalog-thread:not(:hover), :root.yotsuba-b .catalog-thread:hover > * {
   border-color: #B7C5D9;
 }
 
diff --git a/src/css/yotsuba.css b/src/css/yotsuba.css
index 402cbd5d1..8abed91c0 100644
--- a/src/css/yotsuba.css
+++ b/src/css/yotsuba.css
@@ -33,6 +33,8 @@
 /* Catalog */
 :root.yotsuba .catalog-thread:hover > * {
   background-color: #F0E0D6;
+}
+:root.yotsuba .catalog-thread:not(:hover), :root.yotsuba .catalog-thread:hover > * {
   border-color: #D9BFB7;
 }