title: Chart.js tooltip not show
body: <p>Chart work fine butt can't see tooltips… 
      I cant find where problem is and what I missing…</p>
  
  <pre><code>&lt;div style="width: 1000px; height: 600"&gt;
  &lt;canvas id="myChart" &gt;&lt;/canvas&gt;
  &lt;/div&gt;
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"&gt;&lt;/script&gt;
  &lt;script&gt;
      var ctx = document.getElementById("myChart").getContext('2d');
      var myNewChart = new Chart(ctx, {
          type: 'line',
          data: {
              labels: ["24.5.2018. 15:23:48", "24.5.2018. 16:00:00", "24.5.2018. 17:00:00", ],
              datasets: [{
                  label: '# Temperature',
                  fill: false,
                  data: [29, 25, 24,  ],
                  backgroundColor: [
                                 ],
                  borderColor: [
                                 ],
                  borderWidth: 1
              }, {
                  label: '# Humidity',
                  data: [54, 62, 64,  ],
                  borderColor: [
            ],
                  borderWidth: 1,
                  fill: false,
                  type: 'line'
              }
          ]
          },
      options: {
      legend: {
        display: true,
        position: 'top',
        labels: {
          boxWidth: 80,
          fontColor: 'rgb(60, 180, 100)'
        }
      },
      tooltips: {
        cornerRadius: 4,
        caretSize: 4,
        xPadding: 16,
        yPadding: 10,
        backgroundColor: 'rgba(0, 150, 100, 0.9)',
        titleFontStyle: 'normal',
        titleMarginBottom: 15
      }
    }
      });
  &lt;/script&gt;
  </code></pre>
  
  <p>Helper seed that I need add more text for posting this but dont konw how simple question make longer…. text text Helper seed that I need add more text for posting this but dont konw how simple question make longer….</p>