如何定位嵌套的div

Question

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<div style="display:inline-block;border:1px solid blue;position:relative;">
  <div style="display:inline-block;border:1px solid red;float:left;">Some words here!!!</div>
  <div id="Pleasedontmovetoleftsideandstayput" style="display:inline-block;float:left;border:1px solid green;">
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div style="width:100px;height:30px;display:block;float:left;">Some words here!!!Some words here!!!Some words here!!! </div>
    <div>  
    </div>
  </div>
</div>

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我希望#Pleasedontmovetoleftsideandstayput保持不变，当我不断向其添加内容时，不要向左移动。当我向其添加内容并在行尾到达时，它会展开并向左移动以填充100％的行，这是我不想要的。