浮动与定位4-10自由编程作业提交

提交浮动与定位4-10自由编程作业，请老师过目

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<!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">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .main {
            width: 100%;
        }
        .main .up, .down {
            width: 100%;
            float: left;
        }
        img, .text {
            width:25%;
            height: 380px;
            float: left;
            display:block;
        }
        .text {
            background-color: rgb(6, 253, 253);
            position: relative;
        }
        h3 {
            margin-top:20px;
            margin-left:20px;
            margin-bottom:30px;
            font-size:24px;
            color:white;
        }
        .white {
            margin-left:20px;
            margin-bottom:20px;
            font-size:16px;
            color:white;
        }
        .gray {
            margin-left:20px;
            margin-bottom:30px;
            font-size:14px;
            color:gray;
        }
        .explore {
            width: 138px;
            height: 40px;
            text-align: center;
            background-color: black;
            color:white;
            line-height:40px;
            position: absolute;
            left:50%;
            margin-left:-69px;
        }
    </style>
</head>
<body>
    <div class="main">
        <div class="up">
            <img src="b1.jpg" alt="">
            <div class="para1 text">
                <h3>Library</h3>
                <div class="white">
                    <p>Lorem Ipsum is simply dummy text of the printing and</p>
                    <p>typesetting industry</p>
                </div>
                <div class="gray">
                    <p>Lorem Ipsum has been the industry's standard dummy text ever</p>
                    <p>since the 1500s, when an unknown printer took a gallery of type</p>
                    <p>and scrambled it to make a type specimen book.</p>
                </div>
                <input type="submit" value="EXPLORE" class="explore">
            </div>
            <img src="b2.jpg" alt="">
            <div class="para2 text">
                <h3>Library</h3>
                <div class="white">
                    <p>Lorem Ipsum is simply dummy text of the printing and</p>
                    <p>typesetting industry</p>
                </div>
                <div class="gray">
                    <p>Lorem Ipsum has been the industry's standard dummy text ever</p>
                    <p>since the 1500s, when an unknown printer took a gallery of type</p>
                    <p>and scrambled it to make a type specimen book.</p>
                </div>
                <input type="submit" value="EXPLORE" class="explore">
            </div>
        </div>
        <div class="down">
            <div class="para3 text">
                <h3>Library</h3>
                <div class="white">
                    <p>Lorem Ipsum is simply dummy text of the printing and</p>
                    <p>typesetting industry</p>
                </div>
                <div class="gray">
                    <p>Lorem Ipsum has been the industry's standard dummy text ever</p>
                    <p>since the 1500s, when an unknown printer took a gallery of type</p>
                    <p>and scrambled it to make a type specimen book.</p>
                </div>
                <input type="submit" value="EXPLORE" class="explore">
            </div>
            <img src="b3.jpg" alt="">
            <div class="para4 text">
                <h3>Library</h3>
                <div class="white">
                    <p>Lorem Ipsum is simply dummy text of the printing and</p>
                    <p>typesetting industry</p>
                </div>
                <div class="gray">
                    <p>Lorem Ipsum has been the industry's standard dummy text ever</p>
                    <p>since the 1500s, when an unknown printer took a gallery of type</p>
                    <p>and scrambled it to make a type specimen book.</p>
                </div>
                <input type="submit" value="EXPLORE" class="explore">
            </div>
            <img src="b4.jpg" alt="">
        </div>
    </div>
</body>
</html>