diff --git a/crates/zed/assets/themes/_base.toml b/crates/zed/assets/themes/_base.toml
index 3e3f15919ef321f8246e7ea4f914949d10036df3..7f343ba1ac2f7a20261099756f88b25c9d717544 100644
--- a/crates/zed/assets/themes/_base.toml
+++ b/crates/zed/assets/themes/_base.toml
@@ -258,7 +258,7 @@ path = { extends = "$text.2", size = 14, margin.left = 12 }
 text_scale_factor = 0.857
 
 [editor.diagnostic_header]
-border = { width = 1, top = true, bottom = true, color = "#ffffff1c" }
+border = { width = 1, top = true, bottom = true, color = "$border.1" }
 code = { extends = "$text.2", size = 14, margin.left = 10 }
 icon_width_factor = 1.5
 text_scale_factor = 0.857
diff --git a/crates/zed/assets/themes/black.toml b/crates/zed/assets/themes/black.toml
index 972ef37132c12e4b6a3f9aad2e5b78dccccf3cb2..47fce47b06b112b6a8de3d9a636231cd469c1979 100644
--- a/crates/zed/assets/themes/black.toml
+++ b/crates/zed/assets/themes/black.toml
@@ -7,6 +7,7 @@ extends = "_base"
 
 [border]
 0 = "#000000B2"
+1 = "#FFFFFF16"
 
 [text]
 0 = { extends = "$text.base", color = "#ffffff" }
diff --git a/crates/zed/assets/themes/dark.toml b/crates/zed/assets/themes/dark.toml
index 9d65a160eb6d1a6ff19c448a19c0231176cd4178..bd6e473a7a10beb4b4ea09ded11217194c6f63fb 100644
--- a/crates/zed/assets/themes/dark.toml
+++ b/crates/zed/assets/themes/dark.toml
@@ -7,6 +7,7 @@ extends = "_base"
 
 [border]
 0 = "#1B222B"
+1 = "#FFFFFF16"
 
 [text]
 0 = { extends = "$text.base", color = "#FFFFFF" }
diff --git a/crates/zed/assets/themes/light.toml b/crates/zed/assets/themes/light.toml
index 18134501ece21622abeb5dd5bca0a958e66f7464..3113a6911012544ace4a3aa453238aa1388e6f6b 100644
--- a/crates/zed/assets/themes/light.toml
+++ b/crates/zed/assets/themes/light.toml
@@ -7,6 +7,7 @@ extends = "_base"
 
 [border]
 0 = "#DDDDDC"
+1 = "#0000000F"
 
 [text]
 0 = { extends = "$text.base", color = "#000000" }