如何上传所有图像时“；溢出:隐藏；是为上传区域设置的

我尝试在不使用任何库的情况下编写图像库。我想将14个jpg文件作为"uniq_image"实例上传到公共图像"moving_image"中。我只成功上传了3个jpg文件，因为在css中为"td"类设置了"overflow：hidden"。

css文件：

//the common long horizontal image that I want to assemble from uniq_images
#moving_image  {
    background-repeat: no-repeat; 
    position: relative;
    border:1px dashed red;
    width: 420px;
    height: 130px;
    left: 10px;
}
//the style for each uploaded image from the file
.uniq_image {
    background-repeat: no-repeat;
    border:1px solid gray;
    width: 120px;
    height: 80px;
    margin: 5px 25px 5px 25px;
    padding:2px
    overflow:hidden;
}
//I set it because I have to fix the cell size
td {
    overflow:hidden;
}

html代码：

....
<td width ="420" height="130" overflow="hidden">
     <div id= "moving_image" >
             <?php
                  $img_folder = 'picture';
                  $dir = dir($img_folder);
                  while (($file = $dir->read()) !== false){
                      echo '<img src="'.$img_folder."/".$file.'" class="uniq_image" >';              
                  $dir->close();
              ?>
      </div>
<td>

那么，我如何修复这个错误并将所有图像上传到"moving_image"中呢？谢谢