title: Angular- Chart.js, how off opacity in line chart?
body: <p>guys, how can i change opacity in line chart?? Look at my chart:</p>
  
  <p><a href="https://i.stack.imgur.com/8DJmK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8DJmK.png" alt="enter image description here"></a></p>
  
  <p>red, gray, and blue background. I need make it 100% invisible.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>&lt;canvas id="line" class="chart chart-line" chart-data="data2"                          chart-labels="labels2" chart-series="series2" chart-options="options2"
  chart-dataset-override="datasetOverride2" chart-click="onClick" chart-colours="colours"&gt;
  &lt;/canvas&gt; 
  </code></pre>
  
  <p>And fragment of JS:</p>
  
  <pre><code>$scope.rysujWykres2 = function (daneX, daneY, daneZ, daneA) { //metoda rysująca wykres
          $scope.labels2 = daneX;
          $scope.series2 = ['Ur', 'Ul', 'Uz'];
          $scope.data2 = [
              daneY,
              daneZ,
              daneA
          ];
          $scope.datasetOverride2 = [{ yAxisID: 'y-axis-1' }];
          $scope.options2 = {
              scales: {
                  yAxes: [
                      {
                      id: 'y-axis-1',
                      type: 'linear',
                      display: true,
                      position: 'left'
                  }
                      ]
              },
              elements: {
                  point: {
                      radius: 1
                  }
              },
              colours: [{
                  fillColor: 'rgba(47, 132, 71, 0.8)',
                  strokeColor: 'rgba(47, 132, 71, 0.8)',
                  highlightFill: 'rgba(47, 132, 71, 0.8)',
                  highlightStroke: 'rgba(47, 132, 71, 0.8)'
          }]
      };
  }
  </code></pre>
  
  <p>but it doesnt work. Can u help me off this colours? I need only lines.</p>