[Chartjs]-How can i give the full Legend a background color in chart js?

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You can use a custom plugin for this:

const plugin = {
  id: 'legendBackground',
  beforeDraw: (chart, args, opts) => {
    const {
      chartArea: {
        width,
        top,
        left
      },
      ctx
    } = chart;
    ctx.fillStyle = opts.color || 'transparent';
    ctx.fillRect(left, 0, width, top)
  }
}

const options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, 3, 5, 2, 3],
      borderColor: 'orange'
    }]
  },
  options: {
    plugins: {
      legendBackground: {
        color: 'pink'
      }
    }
  },
  plugins: [plugin]
}

const ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.js"></script>
</body>

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