这是大学生就业网站最基础的布局。

<!DOCTYPE html>
<html>
<head>
   <title>大学生就业网站</title>
   <style>
       /* Reset default margin and padding */
       *, *::before, *::after {
           margin: 0;
           padding: 0;
           box-sizing: border-box;
       }

       /* Set default font family and size */
       body {
           font-family: Arial, sans-serif;
           font-size: 16px;
           line-height: 1.5;
       }

       /* Header styles */
       header {
           background-color: #333;
           color: #fff;
           padding: 20px;
       }

       header h1 {
           font-size: 2.5rem;
           margin-bottom: 10px;
       }

       header nav {
           display: flex;
           justify-content: space-between;
           align-items: center;
       }

       header nav ul {
           display: flex;
           list-style: none;
       }

       header nav ul li {
           margin-left: 20px;
       }

       header nav ul li a {
           color: #fff;
           text-decoration: none;
           transition: color 0.3s ease;
       }

       header nav ul li a:hover {
           color: #ddd;
       }

       /* Banner styles */
       .banner {
           position: relative;
           height: 400px;
           background-image: url('https://via.placeholder.com/1500x400');
           background-position: center;
           background-size: cover;
       }

       .banner::before {
           content: '';
           position: absolute;
           top: 0;
           left: 0;
           height: 100%;
           width: 100%;
           background-color: rgba(0, 0, 0, 0.3);
       }

       .banner-text {
           position: absolute;
           top: 50%;
           left: 50%;
           transform: translate(-50%, -50%);
           text-align: center;
           color: #fff;
           font-size: 2rem;
           letter-spacing: 2px;
           text-shadow: 1px 1px #333;
       }

       /* Main content styles */
       .main {
           margin: 40px auto;
           max-width: 1200px;
           display: flex;
           flex-wrap: wrap;
           justify-content: space-between;
       }

       .card {
           width: calc(33.33% - 10px);
           margin-bottom: 20px;
           background-color: #f9f9f9;
           border: 1px solid #ddd;
           transition: transform 0.3s ease;
       }

       .card:hover {
           transform: translateY(-5px);
       }

       .card img {
           width: 100%;
           height: 200px;
           object-fit: cover;
       }

       .card h2 {
           font-size: 1.5rem;
           margin: 10px;
       }

       .card p {
           font-size: 1rem;
           margin: 10px;
       }

       /* Footer styles */
       footer {
           background-color: #333;
           color: #fff;
           padding: 20px;
           text-align: center;
       }

       footer p {
           margin-bottom: 10px;
       }

       footer a {
           color: #fff;
           text-decoration: none;
           transition: color 0.3s ease;
       }

       footer a:hover {
           color: #ddd;
       }

       /* Animation styles */
       @keyframes fadeIn {
           from { opacity: 0; }
           to { opacity: 1; }
       }

       .fade-in {
           animation: fadeIn 1s ease;
       }

       @keyframes slideInLeft {
           from { transform: translateX(-100%); }
           to { transform: translateX(0); }
       }

       .slide-in-left {
           animation: slideInLeft 1s ease;
       }

       @keyframes slideInRight {
           from { transform: translateX(100%); }
           to { transform: translateX(0); }
       }

       .slide-in-right {
           animation: slideInRight 1s ease;
       }
   </style>
</head>
<body>
   <header>
       <nav>
           <h1>大学生就业网站</h1>
           <ul>
               <li><a href="#">首页</a></li>
               <li><a href="#">职位列表</a></li>
               <li><a href="#">公司列表</a></li>
               <li><a href="#">联系我们</a></li>
           </ul>
       </nav>
   </header>

   <div class="banner">
       <div class="banner-text fade-in">
           <h2>欢迎来到大学生就业网站</h2>
           <p>找到属于你的职业</p>
       </div>
   </div>

   <main class="main">
       <div class="card slide-in-left">
           <img src="https://via.placeholder.com/400x200" alt="Company Logo">
           <h2>公司名称</h2>
           <p>公司介绍公司介绍公司介绍公司介绍公司介绍公司介绍</p>
       </div>
       <div class="card slide-in-right">
           <img src="https://via.placeholder.com/400x200" alt="Company Logo">
           <h2>公司名称</h2>
           <p>公司介绍公司介绍公司介绍公司介绍公司介绍公司介绍</p>
       </div>
       <div class="card slide-in-left">
           <img src="https://via.placeholder.com/400x200" alt="Company Logo">
           <h2>公司名称</h2>
           <p>公司介绍公司介绍公司介绍公司介绍公司介绍公司介绍</p>
       </div>
       <div class="card slide-in-right">
           <img src="https://via.placeholder.com/400x200" alt="Company Logo">
           <h2>公司名称</h2>
           <p>公司介绍公司介绍公司介绍公司介绍公司介绍公司介绍</p>
       </div>
       <div class="card slide-in-left">
           <img src="https://via.placeholder.com/400x200" alt="Company Logo">
           <h2>公司名称</h2>
           <p>公司介绍公司介绍公司介绍公司介绍公司介绍公司介绍</p>
       </div>
       <div class="card slide-in-right">
           <img src="https://via.placeholder.com/400x200" alt="Company Logo">
           <h2>公司名称</h2>
           <p>公司介绍公司介绍公司介绍公司介绍公司介绍公司介绍</p>
       </div>
   </main>