CSS部分代码：

相关代码：

* {
    margin: 0;
    padding: 0;
}
a {
    text-decoration: none;
}
ul,ol {
    list-style: none;
}
body {
    font: normal 14px/25px "微软雅黑";
}
/* header区域 */
header {
    width: 100%;
    height: 80px;
    background-color:  #07cbc9;
}
header .header-top {
    width: 1200px;
    height: 80px;
    margin: 0px auto;
}
header .header-top .logo {
    width: 260px;
    height: 48px;
    float: left;
    padding-top: 16px;
    padding-bottom: 16px;
}
header .header-top .logo img {
    width: 260px;
    height: 48px;
}
header .header-top .main-nav {
    height: 80px;
    float: right;
}
header .header-top .main-nav ul {
    height: 80px;
}
header .header-top .main-nav ul li {
    width: 100px;
    height: 80px;
    float: left;
    margin-right: 20px;
    text-align: center;
    line-height: 80px;
}
header .header-top .main-nav ul li a{
    display: block;
    width: 100px;
    height: 80px;
    color: white;
    font-size: 16px;
}
header .header-top .main-nav ul li a:hover {
    background-color: orange;
}

/* banner区域 */
.banner {
    width: 100%;
    height: 800px;
    position: relative;
}
.banner .banner-pictures{
    width: 100%;
    height: 800px;
}
.banner .banner-pictures img{
    width: 100%;
    height: 800px;
}
/* 遮罩层 */
.banner .banner-shade {
    position: absolute;
    width: 100%;
    height: 800px;
    top: 0px;
    left: 0px;
    background-color:rgba(0, 0, 0, 0.5);
}
/* banner表单 */
.banner .banner-form {
    width: 504px;
    /* 实现水平居中 */
    position: absolute;
    left: 50%;
    margin-left: -252px;
    top: 100px;
    overflow: hidden;
    /* 输入框居中 */
    text-align: center;
}
.banner .banner-form input,textarea {
    background: none;
    color: #808080;
    /* 鼠标点击时去掉边框 */
    outline: none;
}
.banner .banner-form .input-box {
    width: 500px;
    height: 36px;
    border: 2px solid #808080;
    margin-bottom: 30px;
}
.banner .banner-form .comment {
    width: 500px;
    height: 106px;
    border: 2px solid #808080;
    margin-bottom: 30px;
}
.banner .banner-form .send-message {
    width: 196px;
    height: 36px;
    border: 2px solid #808080;
}
/* about区域 */
.content .about{
    width: 1201px;
    margin: 0 auto;
    margin-top: 30px;
    overflow: hidden;
}
/* <!-- about区域的标题和简短描述(跟下面的gallery简短标题与描述样式一致) --> */
.content .about .about-title-short-description {
    width: 1201;
}
.content .about .about-title-short-description h2,.content .gallery .gallery-title-short-description h2 {
    text-align: center;
    font-size: 32px;
}
.content .about .about-title-short-description .divider,.content .gallery .gallery-title-short-description .divider {
    width: 60px;
    height: 3px;
    background-color: #07cbc9;
    margin: 10px auto;
}
.content .about .about-title-short-description p,.content .gallery .gallery-title-short-description p {
    font-size: 14px;
    color: gray;
    text-align: center;
}
/* about区域的详细描述 */
.content .about .about-detailed-description {
    width: 1201px;
    height: 434px;
    padding-top: 30px;
    position: relative;
}
/* 左部分区域 */
.content .about .about-detailed-description .about-left {
    float: left;  
}
.content .about .about-detailed-description .about-left h2{
    margin-bottom: 20px;
    margin-right: 158px;
}
.content .about .about-detailed-description .about-left .about-left-description {
    width: 300px;
    padding: 20px;
    border: 1px solid gray;
    font-size: 18px;
    position: absolute;
    top: 50%;
    left: 0;
    margin-top: -100px;
    background:rgba(255, 255, 255, .5)
}
.content .about .about-detailed-description .about-left .about-left-description a{
    display: block;
    width: 140px;
    height: 40px;
    background-color: black;
    color: white;
    line-height: 40px;
    text-align: center;
    margin-top: 30px;
}
/* 中部图片区域 */
.content .about .about-detailed-description .about-among{
    width: 650px;
    height: 435px;
    float: left;
}
.content .about .about-detailed-description .about-among img {
    width: 650px;
    height: 435px;
}
/* 右部分区域 */
.content .about .about-detailed-description .about-right {
    width: 260px;
    float: right;
}
.content .about .about-detailed-description .about-right .about-right-box {
    width: 178px;
    padding: 40px;
    border: 1px solid #07cbc9;
    text-align: center;
}
.content .about .about-detailed-description .about-right .about-right-box p{
    font-size: 28px;
    font-weight: bold;
}
.content .about .about-detailed-description .about-right .about-right-box .divider {
    width: 60px;
    height: 3px;
    background-color: #07cbc9;
    margin: 10px auto;
}
.content .about .about-detailed-description .about-right .top {
    margin-bottom: 30px;
}
/* 图文混排区域 */
.content .pictures-and-text {
    width: 100%;
    height: 760px;
    margin-top: 20px;

}
/* 四张图片四块文字实现两排四列效果 */
.content .pictures-and-text .picture img {
    display: block;
    width: 25%;
    height: 380px;
    float: left;
}
.content .pictures-and-text .text {
    width: 25%;
    height: 380px;
    float: left;
    background-color: #07cbc9;
    position: relative;

}
/* 第一排三角形 */
.content .pictures-and-text .first-triangle::before {
    content: " ";
    width: 0;
    height: 0;
    border: 20px solid transparent;
    border-right-color: #07cbc9;
    position: absolute;
    top: 170px;
    left: -40px;
}
/* 第二排三角形 */
.content .pictures-and-text .second-triangle::before {
    content: " ";
    width: 0;
    height: 0;
    border: 20px solid transparent;
    border-left-color: #07cbc9;
    position: absolute;
    bottom: 170px;
    right: -40px; 
}
.content .pictures-and-text .text h3 {
    padding: 20px 0px 30px 20px;
    font-size: 24px;
    color: white;
}
.content .pictures-and-text .text p:nth-child(2) {
    font-size: 16px;
    padding: 0px 20px 20px 20px;
}
.content .pictures-and-text .text p:nth-child(3) {
    font-size: 14px;
    color: gray;
    padding: 0px 20px;
}
.content .pictures-and-text .text a.button {
    display: block;
    background-color: black;
    color: white;
    line-height: 40px;
    text-align: center;
    width: 138px;
    height: 40px;
    margin: 0 auto;
    margin-top: 30px;
}
/* gallery区域 */
.content .gallery {
    width: 1200px;
    margin: 0 auto;
    margin-top: 30px;
}
/* 标题与简短描述样式跟上面ABOUT区域一致 */
.content .gallery .gallery-title-short-description {
    width: 1200px;
    margin: 0 auto;
}
/* gallery的详细区域 */
.content .gallery .detailed-information {
    width: 1160px;
    height: 613px;
    padding: 20px;
}
.content .gallery .detailed-information div.box {
    width: 360px;
    height: 290px;
    float: left;
    margin-right: 40px;
    margin-bottom: 20px;
    overflow: hidden;
}
.content .gallery .detailed-information div:nth-child(3),.content .gallery .detailed-information div:nth-child(6){
    margin-right: 0px;
}
.content .gallery .detailed-information div dl dt img{
    display: block;
    width: 360px;
    height: 240px;
}
.content .gallery .detailed-information div dl dd {
    width: 360;
    height: 50px;
    background-color: black;
    color: white;
    line-height: 50px;
    padding-left:20px;
}
/* footer区域 */
footer {
    margin-top: 10px;
    width: 100%;
    height: 80px;
    background-color: #07cbc9;
    text-align: center;
    line-height: 80px;
}

HTML部分代码：

相关代码：

​<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="Keywoeds" content="#">
    <meta name="Description" content="#">
    <title>Career-Builder</title>
    <link rel="stylesheet" href="css/css.css">
</head>
<body>
    <!-- 网页头部 -->
    <header>
        <div class="header-top">
            <!-- 网页的LOGO -->
            <div class="logo">
                <img src="images/logo.png" alt="">
            </div>

            <!-- 网页的导航 -->
            <nav class="main-nav">
                <ul>
                    <li><a href="">HOME</a></li>
                    <li><a href="">ABOUT</a></li>
                    <li><a href="">GALLERY</a></li>
                    <li><a href="">FACULTY</a></li>
                    <li><a href="">EVENTS</a></li>
                    <li><a href="">CONTACT</a></li>
                </ul>
            </nav>
        </div>
    </header>

    <!-- 网页的横幅 -->
    <section class="banner">
        <!-- 网页横幅的图片 -->
        <div class="banner-pictures">
            <img src="images/banner3.jpg" alt="">
        </div>

        <!-- 网页横幅的遮罩层 -->
        <div class="banner-shade">
        </div>

        <!-- 网页横幅的表单 -->
        <div class="banner-form">
            <form action="" method="POST">
                <p>
                    <input class="input-box" type="text" placeholder="your Name">
                </p>
                <p>
                    <input class="input-box" type="text" placeholder="your Phone">
                </p>
                <p>
                    <input class="input-box" type="email" placeholder="your Email">
                </p>
                <p>
                    <textarea class="comment" cols="30" rows="10" placeholder="Write Your Comment Here"></textarea>
                </p>
                <p>
                    <input class="send-message" type="submit" value="SEND MESSAGE">
                </p>
            </form>
        </div>
    </section>

    <!-- 网页的内容区域 -->
    <section class="content">

        <!-- 网页的标题和描述区域 -->
        <div class="about">
            <!-- 标题和简短描述 -->
            <div class="about-title-short-description">
                <!-- 标题 -->
                <h2>ABOUT</h2>
                <!-- 简短描述 -->
                <div class="divider"></div>
                <p>Lorem Ipsum is simply dummy text of the printing and typesetting <br> industry. Lorem Ipsum has been the industry's standard dummy <br> text ever since the 1500s.</p>

            </div>

            <!-- 详细描述 -->
            <div class="about-detailed-description">
                <!-- 左部分 -->
                <div class="about-left">
                    <!-- 左边部分标题 -->
                    <h2>A WORD <br> ABOUT US</h2>

                    <!-- 左边部分内容 -->
                    <div class="about-left-description">
                        <P>Praesent dignissim viverra est, sed bibendum ligula congue non. Sed ac nisl et felis gravida commodo? Suspendisse eget ullamcorper ipsum. Suspendisse diam amet.</P>
                        <a href="">EXPLORE</a>
                    </div>
                </div>

                <!-- 中部 -->
                <div class="about-among">
                    <img src="images/bb3.jpg" alt="">
                </div>

                <!-- 右部分 -->
                <div class="about-right">
                    <!-- 右边上部分内容 -->
                    <div class="about-right-box top">
                        <p>70000</p>
                        <div class="divider"></div>
                        <div>Students</div>
                    </div>

                    <!-- 右边下半部分内容 -->
                    <div class="about-right-box bottom">
                        <p>600</p>
                        <div class="divider"></div>
                        <div>Faculty</div>
                    </div>
                </div>
            </div>
        </div>

        <!-- 网页的图文混排区域 -->
        <div class="pictures-and-text">
            <!-- 图片1 -->
            <div class="picture">
                <img src="images/b1.jpg" alt="">
            </div>
            <!-- 文字2 -->
            <div class="text first-triangle">
                <h3>Library</h3>
                <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
                <p>Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
                <a href="" class="button">EXPLORE</a>
            </div>

            <!-- 图片3 -->
            <div class="picture">
                <img src="images/b2.jpg" alt="">
            </div>
            <!-- 文字4 -->
            <div class="text first-triangle">
                <h3>Library</h3>
                <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
                <p>Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
                <a href="" class="button">EXPLORE</a>
            </div>

            <!-- 文字5 -->
            <div class="text second-triangle">
                <h3>Library</h3>
                <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
                <p>Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
                <a href="" class="button">EXPLORE</a>
            </div>
            <!-- 图片6 -->
            <div class="picture">
                <img src="images/b3.jpg" alt="">
            </div>

            <!-- 文字7 -->
            <div class="text second-triangle">
                <h3>Library</h3>
                <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
                <p>Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
                <a href="" class="button">EXPLORE</a>
            </div>
            <!-- 图片8 -->
            <div class="picture">
                <img src="images/b4.jpg" alt="">
            </div>  
        </div>

        <!-- 网页的展示区 -->
        <div class="gallery">
            <!-- 标题和简短描述 -->
            <div class="gallery-title-short-description">
                <!-- GALLERY标题 -->
                <h2>GALLERY</h2>
                <!-- 简短描述 -->
                <div class="divider"></div>
                <p>Lorem Ipsum is simply dummy text of the printing and typesetting <br> industry. Lorem Ipsum has been the industry's standard dummy <br> text ever since the 1500s.</p>

            </div>

            <!-- 详细信息区 -->
            <div class="detailed-information">

                <!-- 第一块内容 -->
                <div class="detailed-information-one box">
                    <dl>
                        <dt><img src="images/03-01.jpg" alt=""></dt>
                        <dd>Science Lab</dd>
                    </dl>
                </div>

                <!-- 第二块内容 -->
                <div class="detailed-information-two  box">
                    <dl>
                        <dt><img src="images/03-02.jpg" alt=""></dt>
                        <dd>Indoor Stadium</dd>
                    </dl>
                </div>

                <!-- 第三块内容 -->
                <div class="detailed-information-three box">
                    <dl>
                        <dt><img src="images/03-03.jpg" alt=""></dt>
                        <dd>Transportation</dd>
                    </dl>
                </div>

                <!-- 第四块内容 -->
                <div class="detailed-information-four box">
                    <dl>
                        <dt><img src="images/03-04.jpg" alt=""></dt>
                        <dd>Kids Room</dd>
                    </dl>
                </div>

                <!-- 第五块内容 -->
                <div class="detailed-information-five box">
                    <dl>
                        <dt><img src="images/03-05.jpg" alt=""></dt>
                        <dd>Meditation Classes</dd>
                    </dl>
                </div>

                <!-- 第六块内容 -->
                <div class="detailed-information-five box">
                    <dl>
                        <dt><img src="images/03-06.jpg" alt=""></dt>
                        <dd>Kids Play Ground</dd>
                    </dl>
                </div>

            </div>
        </div>
    </section>

    <!-- 网页的页脚 -->
    <footer>
        <p>&copy;2016 imooc.com 京ICP备13046642号</p>
    </footer>
</body>
</html>