diff --git a/index.html b/index.html
index 09468be..7614074 100644
--- a/index.html
+++ b/index.html
@@ -86,6 +86,8 @@ WhatColorIsIt.prototype.spectrum = function(today) {
   var tomorrow = today + 86400000;
   var increment = (tomorrow - today) / this.spectrumDiv.offsetWidth;
 
+  this.spectrumDiv.innerHTML = '';
+
   for(var i = today; i < tomorrow; i += increment) {
     color = document.createElement('div');
     color.style.background = this.toColor(new Date(i));
@@ -117,6 +119,13 @@ WhatColorIsIt.prototype.process = function(d) {
 
 WhatColorIsIt.prototype.run = function() {
   this.spectrum(Date.today());
+  window.addEventListener('resize', function() {
+    if(typeof resizewait != 'undefined') {
+      clearTimeout(resizewait);
+    }
+    resizewait = setTimeout(function() { this.spectrum(Date.today()); }.bind(this), 200);
+  }.bind(this));
+
   this.start();
 };
 WhatColorIsIt.prototype.start = function() {