diff -r 3470535a6caa -r 01ad654237d5 client/src/components/SessionSummary.js
--- a/client/src/components/SessionSummary.js	Sat Dec 01 02:38:21 2018 +0100
+++ b/client/src/components/SessionSummary.js	Mon Dec 03 17:53:37 2018 +0100
@@ -9,7 +9,12 @@
   <div className="session-summary-list">
     <ul className="list-group sticky-left">
       {notes.map((note) => {
-        const bgColor = note.categories.length > 0 ? Color(note.categories[0].color).lighten(0.5).hex() : "transparent";
+        let bgColor = "transparent";
+        if(note.categories.length > 0) {
+          const hsl = Color(note.categories[0].color).hsl();
+          const l = hsl.lightness();
+          bgColor = hsl.lighten(50.0/l-0.5).hex();
+        }
         return (
         <li className="list-group-item border-0 py-1" key={note._id}>
             <a href={'#note-' + note._id}>