diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64cc0d2..f410935 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## [1.21.17](https://github.com/pengx17/logseq-dev-theme/compare/v1.21.16...v1.21.17) (2021-11-22)
+
+
+### Bug Fixes
+
+* smaller code mirror font-size ([ce5925e](https://github.com/pengx17/logseq-dev-theme/commit/ce5925e01314f205acac1e6ba3bf2073cc4526be))
+
 ## [1.21.16](https://github.com/pengx17/logseq-dev-theme/compare/v1.21.15...v1.21.16) (2021-11-18)
 
 
diff --git a/custom.css b/custom.css
index 8f4c3e3..d04fbab 100644
--- a/custom.css
+++ b/custom.css
@@ -782,6 +782,22 @@ progress::-webkit-progress-value {
   background: var(--ls-tertiary-background-color) !important;
 }
 
+.CodeMirror pre.CodeMirror-line,
+.CodeMirror-gutter,
+.CodeMirror-gutters,
+.CodeMirror-linenumber,
+.CodeMirror-scroll,
+.CodeMirror-sizer,
+.CodeMirror {
+  font-size: 12px;
+  line-height: 16px;
+}
+
+.CodeMirror {
+  background-color: var(--color-level-1);
+  box-shadow: 0 0 0 2px var(--color-level-2);
+}
+
 /* Popups */
 .tippy-tooltip {
   padding: 0.5em 0;
diff --git a/package.json b/package.json
index 44cf70d..221fb8b 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "logseq-dev-theme",
   "author": "pengx17",
-  "version": "1.21.16",
+  "version": "1.21.17",
   "description": "A custom theme for dev",
   "logseq": {
     "themes": [