index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <title>Neon Volume Control Bar</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" type="text/css" media="screen" href="style.css" />
  </head>

  <body>
    <div class="box">
      <div class="spinner">
        <span id="output"></span>
        <div class="progress">
          <span id="meter"></span>
        </div>
        <div class="btn plus" onclick="plus()">+</div>
        <div class="btn minus" onclick="minus()">-</div>
      </div>
    </div>

    <script>
      let x = 0;
      let output = document.getElementById("output");
      let meter = document.getElementById("meter");
      output.innerHTML = x;

      function plus() {
        if (x >= 10) {
          return false;
        }
        if (x >= 7) {
          meter.style.background = "#f00";
          meter.style.filter =
            "drop-shadow(0 0 2.5px #f00) drop-shadow(0 0 10px #f00)";
        }
        output.innerHTML = ++x;
        meter.style.height = x * 10 + "%";
      }

      function minus() {
        if (x <= 0) {
          return false;
        }
        if (x <= 7) {
          meter.style.background = "#0f0";
          meter.style.filter =
            "drop-shadow(0 0 2.5px #0f0) drop-shadow(0 0 10px #0f0)";
        }
        output.innerHTML = --x;
        meter.style.height = x * 10 + "%";
      }
    </script>
  </body>
</html>
HTMLify

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