JSFiddle - React, Tailwind, and code Playground

HTML

<div style="width: 900px; background-color: Gray;">
    
    <div style="width: 165px; border: solid 1px yellow; float:left;"> 
        <div style="width: 155px;">A</div> 
    </div> 
    
    <asp:PlaceHolder ID="phTest" runat="server" Visible="true"> 
        
        <div style="width: 230px; float: left;"> 
            
            <div style="width: 230px;">B</div> 
      
        </div> 
   </asp:PlaceHolder> 
    
    <div style="border: solid 1px green;">C</div> 

</div>