效果图

预留了顶部位置准备加图标的，有需要的可以研究，也可以自己改进。

CSS

    /* 小菜单 */
            .nav-fl{
                font-size: 14px;
                width: 726px;
                height: 100px;
                background-color: #ffffff;
                margin: 0 auto;
            }
            /* 菜单下的列表 */
            .nav-fl li{
                width: 120px;
                height: 100px;
                border-right: 1px dashed;
                text-align: center;
                position: relative;
                float: left;
                overflow: hidden;

            }
            /* 菜单下面按钮样式 */
            .nav-fl button{
                width: 60%;
                height:30px;
                border: 0;
                color: #fff;
                background-color: #55aaff;
                margin-top:12px;
                cursor: pointer;
            }
            .nav-fl span:nth-child(1){
                margin-top:40px;
                padding: 5px 0;
                width: 110px;
                display: inline-block;
            }
            /* 菜单下面的列 */
            .nav-fl .cs{
                width: 120px;
                height: 100px;
                background-color:#fff;
                position: absolute;
                transition: all 0.2s;

            }
            .nav-fl li:last-child{
                border-right:0;
            }
            li:hover .cs{
                /* 像上移动 */
                margin-top:-40px;
            }

HTML

<div class="nav-fl">
            <ul>
                <li>
                    <div class="cs">
                        <span>相册图库</span>
                        <span>图片相册介绍</span>
                        <a href="#"><button>点击进入</button></a>
                    </div>
                </li>

                <li>
                    <div class="cs">
                        <span>相册图库</span>
                        <span>图片相册介绍</span>
                        <a href="#"><button>点击进入</button></a>

                    </div>
                </li>

                <li>
                    <div class="cs">
                        <span>相册图库</span>
                        <span>图片相册介绍</span>
                        <a href="#"><button>点击进入</button></a>

                    </div>
                </li>

                <li>
                    <div class="cs">
                        <span>相册图库</span>
                        <span>图片相册介绍</span>
                        <a href="#"><button>点击进入</button></a>

                    </div>
                </li>

                <li>
                    <div class="cs">
                        <span>相册图库</span>
                        <span>图片相册介绍</span>
                        <a href="#"><button>点击进入</button></a>

                    </div>
                </li>

                <li>
                    <div class="cs">
                        <span>相册图库</span>
                        <span>图片相册介绍</span>
                        <a href="#"><button>点击进入</button></a>

                    </div>
                </li>
            </ul>
        </div>