<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0"
    />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div>
      <div
        onclick="panelClicked(event.currentTarget)"
        class="panel top-left-panel"
      ></div>
      <div
        onclick="panelClicked(event.currentTarget)"
       