麻烦老师帮我看一下

<!-- Gallery区域 -->
    <div class="Gallery">
        <!-- Gallery上半部分 -->
        <div class="gallery-top">
            <div class="gallery-header">
                <h2>GALLERY</h2>
                <div class="fengexian4"></div>
            </div>

            <div class="gallery-wenzi">
                <p>
                    Lorem Ipsum is simply dummy text of the printing and typesetting
                </p>
                <p>
                    industry. Lorem Ipsum has been the industry's standard dummy   
                </p>
                <p>
                    text ever since the 1500s. 
                </p>
            </div>
        <!-- Gallery下半部分 -->
        <div class="Gallery2">
            <div class="all">
                <dl>
                    <dt><img src="images/03-01.jpg" alt=""></dt>
                    <dd><span>Science Lab</span></dd>
                </dl>


                <dl>
                    <dt><img src="images/03-02.jpg" alt=""></dt>
                    <dd><span>ndoor Stadium</span></dd>
                </dl>


                <dl>
                    <dt><img src="images/03-03.jpg" alt=""></dt>
                    <dd><span>Transportation</span></dd>
                </dl>

                <dl>
                    <dt><img src="images/03-04.jpg" alt=""></dt>
                    <dd><span>Kids Room</span></dd>
                </dl>

                <dl>
                    <dt><img src="images/03-05.jpg" alt=""></dt>
                    <dd><span>Meditation Classes</span></dd>
                </dl>

                <dl>
                    <dt><img src="images/03-06.jpg" alt=""></dt>
                    <dd><span>Kids Play Ground</span></dd>
                </dl>
            </div>

        </div>
    </div>

/* Gallery区域 */
.Gallery{
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}
/* Gallery上半部分 */
.Gallery .gallery-top{
    width: 1200px;
    text-align: center;
}
.Gallery .gallery-top .gallery-header h2{
    font-size: 32px;
}
.Gallery .gallery-top .gallery-header .fengexian4{
    width: 60px;
    height: 3px;
    background-color: #07cbc9;
    margin: 0 auto;
}
.Gallery .gallery-top .gallery-wenzi{
    color: gray;
    font-size: 14px;
}
/* Gallery 下半部分 */
.Gallery .Gallery2{
    padding-top: 30px;
    width: 1201px;
    height: 653px;
    /* 设置相对位置 */
    position: relative;
   background-color: orange;
}
/* 设置绝对位置 */
.Gallery .Gallery2 .all{
    position: absolute;
    width: 1200px;
    height: 652px;
    top: 50%;
    left: 50%;
    margin-top: -326px;
    margin-left: -600px;
}

.Gallery .Gallery2 dl{
    float: left;
    margin-right: 40px;
    margin-bottom: 30px;
    width: 360px;
    height: 290px;
}
.Gallery .Gallery2 dl img{
    width: 360px;
    height: 240px;
    display: block;
}
.Gallery .Gallery2 dl dd{
    width: 360px;
    height: 50px;
    background-color: black;
    color: white;
    float: left;
}
.Gallery .Gallery2 dl dd span{
    float: left;
    margin-left: 20px;
   line-height: 50px;
}