diff --git a/src/react/LogMonitorButton.js b/src/react/LogMonitorButton.js
index 545ebc34..40addb1d 100644
--- a/src/react/LogMonitorButton.js
+++ b/src/react/LogMonitorButton.js
@@ -68,7 +68,7 @@ export default class LogMonitorButton extends React.Component {
         opacity: 0.2,
         cursor: 'text',
         backgroundColor: 'transparent'
-      }
+      };
     }
     return (
       <a onMouseEnter={::this.handleMouseEnter}
diff --git a/src/utils/brighten.js b/src/utils/brighten.js
index c6aa01ee..8599ec1d 100644
--- a/src/utils/brighten.js
+++ b/src/utils/brighten.js
@@ -1,16 +1,16 @@
-export default function(hex, lum) {
-  hex = String(hex).replace(/[^0-9a-f]/gi, "");
+export default function(hexColor, lightness) {
+  let hex = String(hexColor).replace(/[^0-9a-f]/gi, '');
   if (hex.length < 6) {
-      hex = hex.replace(/(.)/g, '$1$1');
+    hex = hex.replace(/(.)/g, '$1$1');
   }
-  lum = lum || 0;
+  let lum = lightness || 0;
 
-  var rgb = "#",
-      c;
-  for (var i = 0; i < 3; ++i) {
-      c = parseInt(hex.substr(i * 2, 2), 16);
-      c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
-      rgb += ("00" + c).substr(c.length);
+  let rgb = '#';
+  let c;
+  for (let i = 0; i < 3; ++i) {
+    c = parseInt(hex.substr(i * 2, 2), 16);
+    c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
+    rgb += ('00' + c).substr(c.length);
   }
   return rgb;
-};
+}