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如您所见,我添加了一个白色边框,以便我们可以看到确切的大小.这里的问题是右侧的社交媒体按钮DIV.

这是HTML：

<div id="content_header">
    <div id="schcontainer" class="schcontainer">
        <%= form_tag({:controller => 'list',:action => 'index'},:id => 'searchfrm') do %>
            <div id="searchBoxwrap">
                <%= text_field_tag(:query,value=@query,options={:size => "47",:placeholder => "Enter a product name..."}) %>
                <%= text_field_tag(:selectedpage,value=@page,options={:class => "hiddenelement"}) %>
            </div>
            <%= submit_tag("") %>
        <% end %>
        <div class="clear"></div>
    </div>   
    <div id="mediabuttons">
        <div class="fb-like" data-send="false" data-layout="button_count" data-show-faces="false"></div>
        <div><a href="https://twitter.com/share" data-url="<%=renderFullUrl%>" data-count="horizontal" class="twitter-share-button" data-size="small">Tweet</a></div>
        <div class="g-plusone" data-size="medium"></div>
        <div><script src="//platform.linkedin.com/in.js" type="text/javascript"></script><script type="IN/Share" data-counter="right"></script></div>
    </div>
</div>
<div class="clear" id="fb-root"></div>

这是CSS

#content_header{
    width:100%;
    background-color:#333333;
    border-bottom: 1px solid #999999;
    -webkit-Box-shadow: 0 0 3px 0 #000;
    -moz-Box-shadow: 0 0 3px 0 #000;
    Box-shadow: 0 0 3px 0 #000;
    padding: 10px 10px 10px 10px;
    height:35px;
    vertical-align: top;
}

#schcontainer{
   width:48%;
   border: 1px solid #FFFFFF;   
}

#mediabuttons{
    width:39%;
    float:right;
    text-align:right;
    border: 1px solid #FFFFFF; 
}

#mediabuttons div{
    margin:0;
    padding:0;
    width:25%;
    float:left;
}


.clear {
   height: 0;
   font-size: 1px;
   margin: 0;
   padding: 0;
   line-height: 0;
   clear: both;
}

任何帮助将不胜感激.

干杯!

更新的CSS：

#content_header{
    float:left;
    overflow:hidden;
    width:100%;
    background-color:#333333;
    border-bottom: 1px solid #999999;
    -webkit-Box-shadow: 0 0 3px 0 #000;
    -moz-Box-shadow: 0 0 3px 0 #000;
    Box-shadow: 0 0 3px 0 #000;
    padding: 10px 10px 10px 10px;
}