diff --git a/src/components/expression/expression.js b/src/components/expression/expression.js
index c6e47c3a..9e884257 100644
--- a/src/components/expression/expression.js
+++ b/src/components/expression/expression.js
@@ -58,7 +58,7 @@ class Expression extends React.Component {
               fontWeight: 700,
               color: "#FFF",
               padding: "12px 20px",
-              backgroundColor: "#448C4D",
+              backgroundColor: globals.darkGreen,
               border: "none",
               cursor: "pointer",
             }}
diff --git a/src/globals.js b/src/globals.js
index 7827dffb..b2a70ef0 100644
--- a/src/globals.js
+++ b/src/globals.js
@@ -30,6 +30,7 @@ export const darkerGrey = "rgb(51,51,51)";
 
 export const brightBlue = "#3B98FC";
 export const brightGreen = "#A2D729";
+export const darkGreen = "#448C4D";
 
 export const tiniestFontSize = 12;