diff --git a/desktop/sources/scripts/library.js b/desktop/sources/scripts/library.js
index f917dce..50f3944 100644
--- a/desktop/sources/scripts/library.js
+++ b/desktop/sources/scripts/library.js
@@ -181,6 +181,11 @@ function Library (ronin) {
     return h[k]
   }
 
+  this.theme = (variable, el = document.documentElement) => {
+    // ex. styleprop('--f_high') to get css variable value
+    return getComputedStyle(el).getPropertyValue(variable)
+  }
+
   // Math
 
   this.add = (...args) => {