css浮动和对齐

css 浮动和对齐

<style>
        * {
            /* 怪异盒模型 */
            box-sizing: border-box;
        }

        .body {
            font-family: Arial, Helvetica, sans-serif;
            /* 文本行高 */
            line-height: 1.4rem;
        }

        .container {
            /* 容器宽度 max-width 设置宽度最大值 页面小于最大值的时候内容会根据 页面大小调整*/
            max-width: 960px;
            /* 居中对齐   margin: auto 他会将我们的容器左右两侧的外边距设置为相等的值*/
            margin: auto;
        }

        .crl {
            /* 清除浮动 在设置浮动的容器下面设置一个清除浮动的div 
            然后再获取到那个容器给他设置clear: both;清除浮动*/
            clear: both;
        }

        .box {
            /* 背景颜色 */
            background-color: #f4f4f4;
            /* 边框实心颜色 */
            border: 1px solid #333;
            /* 内边距 */
            padding: 20px;
            /* 外边距 */
            margin-bottom: 10px;
        }

        /* 文本对齐的方式 */
        .box p {
            /* 默认左对齐 */
            text-align: left;
            /* 右对齐 */
            text-align: right;
            /* 居中对齐 */
            text-align: center;
            /* 两端对齐 当页面缩小的时候实现两端对齐 */
            text-align: justify;
        }

        /* 浮动布局 */
        #box-2 {
            /* 左浮动 */
            float: left;
            width: 60%;
        }

        #box-3 {
            /* 右浮动 */
            float: right;
            width: 38%;
        }
    </style>

<!-- container 外部容器 -->
    <div class="container">
        <div id="box-1" class="box">
            <h3>标题一</h3>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Ipsam incidunt facilis assumenda magni ex quis
                consectetur a, aperiam ullam reprehenderit, soluta iure ipsa quam eligendi, exercitationem aliquam ad
                commodi? Error.</p>
        </div>
        <div id="box-2" class="box">
            <h3>标题二</h3>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Ipsam incidunt facilis assumenda magni ex
                quis
                consectetur a, aperiam ullam reprehenderit, soluta iure ipsa quam eligendi, exercitationem aliquam
                ad
                commodi? Error.</p>
        </div>
        <div id="box-3" class="box">
            <h3>标题三</h3>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Ipsam incidunt facilis assumenda magni ex
                quis
                consectetur a, aperiam ullam reprehenderit, soluta iure ipsa quam eligendi, exercitationem aliquam
                ad
                commodi? Error.</p>
        </div>
        <!-- 浮动标签 -->
        <div class="crl"></div>
        <div id="box-4" class="box">
            <h3>标题四</h3>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Ipsam incidunt facilis assumenda magni ex quis
                consectetur a, aperiam ullam reprehenderit, soluta iure ipsa quam eligendi, exercitationem aliquam ad
                commodi? Error.</p>
        </div>
    </div>