drop-down menu

by slacr_

HTML

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    :root {
      --nav-color: lime;
      --nav-height: 70px;
    }

    * {
      padding: 0;
      border: 0;
      margin: 0;
      box-sizing: border-box;
    }

    li {
      list-style: none;
    }

    body {
      position: relative;
      width: 100vw;
      height: 100vh;
    }

    .container {
      position: fixed;
      display: flex;
      left: 50%;
      top: 50%;
      width: 1000px;
      height: var(--nav-height);
      transform: translate(-50%, -50%);
    }

    .nav {
      width: 100%;
      height: 100%;
      display: flex;
    }

    .nav>li {
      flex: 1;
    }

    .nav>li:not(:first-child) {
      margin-left: -1px;
    }

    .subnav {
      display: flex;
      flex-direction: column;
      align-items: center;
      max-height: var(--nav-height);
      overflow: hidden;
      transition: all cubic-bezier(0.77, 0, 0.175, 1) .4s;
    }

    .subnav:hover {
      max-height: 400px;
    }

    .subnav>li {
      position: relative;
      width: 100%;
      height: var(--nav-height);
      text-align: center;
      line-height: var(--nav-height);
      background-color: var(--nav-color);
      border: 1px solid;
      cursor: pointer;
    }

    .subnav>li:not(:first-child) {
      margin-top: -1px;
    }

    .subnav>li:hover::after {
      position: absolute;
      left: 0;
      top: 0;
      content: '';
      display: block;
      width: 100%;
      height: 100%;
      background-color: rgba(255, 255, 255, .6);
    }
  </style>


</head>

<body>
  <div class="container">
    <ul class="nav">
      <li>
        <ul class="subnav">
          <li>Orange</li>
          <li>Banana</li>
          <li>Pear</li>
        </ul>
      </li>
      <li>
        <ul class="subnav">
          <li>Orange</li>
          <li>Banana</li>
          <li>Pear</li>
       ...