<div class="aboutDown">

            <div class="leftWord">
                <h2>A WORD</h2>
                <h2>ABOUT US</h2>
                <div class="para">
                    <p class="p1">Praesent dignissim viverra est, sed bibendum ligula congue non. Sed ac nisl et felis gravida commodo?
                        Suspendisse eget ullamcorper ipsum. Suspendisse diam amet.</p>
                    <p class="p2">EXPLORE</p>
                </div>               
            </div>

            <img class="img" src="./images/bb3.jpg" alt="">

            <div class="rightWord">
                <div class="box1">
                    <p>70000</p>
                    <p>分割线</p>
                    <p>student</p>
                </div .box2>

                <div>
                    <p>600</p>
                    <p>Faculty</p>
                </div>
            </div>
        </div>

​.about .aboutDown{
    width: 1200px;
    height: 465px;
    /* background: gray; */
    margin:0 auto ;
    /* position: relative; */
}



.about .aboutDown img.img{
    width: 650px;
    height: 435px;
    margin:30px auto 0;


}

.about .aboutDown .leftWord{
    float: left;
}

.about .aboutDown .leftWord .para{
    width: 300px;
    margin:20px;
    background: rgba(255,255, 255, 0.5);

}
.about .aboutDown .rightWord{
    float: right;
}

代码还未完全完成，但是有个问题，为什么这里图片无法居中呢~margin:0 auto;也不行，左侧盒子浮动了不应该是脱离文档流了吗~