It is all there if you right-click on the page and choose "view source".But here is the code that deals specifically with the layout within the body of the page:
<body class="claro">
<div id="mainWindow" dojotype="dijit.layout.BorderContainer" design="headline"
gutters="false" style="width:100%; height:100%;">
<div id="header" dojotype="dijit.layout.ContentPane" region="top">
<div align="left"><table width="100%" height="140" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="580"><img src="/images/logo_header_580.png" width="580" height="140"></td>
<td><div style="float:right; margin-right:20px; margin-top:10px;">
<table>
<tr>
<td>
<span class="green">SEARCH</span></td>
<td>
<input name="SEARCH" type="text" class="titles" id="SEARCH" size="30" onkeydown="if (event.keyCode == 13){ runSearch(); return false; }"></td>
<td>
<a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('search','','/images/go_up.png',1)"><img src="/images/go.png" onclick="runSearch();" /></a></td>
</tr>
</table><br />
<strong class="bluePlain">Contact Us</strong> <span class="green">|</span> <strong class="bluePlain"><a href="https://community.esri.com/Employment/CurrentOpenings.aspx">Employment</a></strong> <span class="green">|</span> <strong class="bluePlain"><a href="http://translate.google.com/translate?hl=en&sl=auto&tl=es&u=http%3A%2F%2Fnorthmiamifl.gov%2F">Español</a></strong> <strong><span class="green">|</span></strong> <strong class="bluePlain"><a href="http://translate.google.com/translate?hl=en&sl=auto&tl=ht&u=http%3A%2F%2Fnorthmiamifl.gov%2F">Kreyol</a></strong>
<br /><strong class="bluePlain">305.893.6511</strong> <span class="green">|</span> <strong class="bluePlain">776 NE 125 Street</strong> <span class="green">|</span> <strong class="bluePlain">North Miami, FL 33161</strong><br />
<table>
<tr>
<td>
<a href="https://community.esri.com/residents/emergency_services.aspx"><img src="/images/emergency.png" /></a></td>
<td>
<strong class="bluePlain"><a href="https://community.esri.com/residents/emergency_services.aspx">EMERGENCY SERVICES</a></strong></td>
</tr>
</table>
</div></td>
</tr>
</table></div>
<div id="subheader"><h1>Welcome to the North Miami Zoning Look Up Tool</h1>
<div class="StandardMargins">
<table height="200"><tr>
<td colspan="4">To determine the zoning of a property, enter the address below:</td>
</tr>
<tr>
<td width="193" class="style2">
<div align="right" class="GreyText">Enter a House Number:</div></td>
<td width="178" align="left" class="style3">
<input name="txtHouseNum" type="text" id="txtHouseNum" size="8" maxlength="8"/>
</td>
<td width="420" rowspan="5" valign="top">
<div id="info" class="MiniMargins"></div>
</td>
<td width="380" rowspan="5" valign="top">
<div id="info2" class="MiniMargins"></div>
</td>
</tr>
<tr>
<td class="style2">
<div align="right" class="GreyText">Choose a Direction (i.e. 'NE':</div>
</td>
<td align="left" class="style3">
<select name="lstDirection" id="lstDirection">
<option value=""></option>
<option value="N">N</option>
<option value="NE">NE</option>
<option value="NW">NW</option>
<option value="S">S</option>
<option value="W">W</option>
</select>
</td>
</tr>
<tr>
<td class="style2">
<div align="right" class="GreyText">Choose a Street Name:</div></td>
<td align="left" class="style3">
<form id="form1" runat="server">
<asp:DropDownList ID="lstStreetName" runat="server"
DataSourceID="StreetNames" DataTextField="StreetName"
DataValueField="StreetName" Width="170px">
</asp:DropDownList>
<asp:SqlDataSource ID="StreetNames" runat="server"
ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
SelectCommand="SELECT [StreetName] FROM [tbStreetNames]"></asp:SqlDataSource>
</form>
</td>
</tr>
<tr>
<td colspan="2" class="style4">
<span class="GreyText">Apartment/condo unit numbers are not neccesary</span></td>
</tr>
<tr align="right">
<td colspan="2" class="style4"><input type="button" onclick="lookUpAddress(document.getElementById('txtHouseNum').value,document.getElementById('lstDirection').value,document.getElementById('lstStreetName').value);" value="Find Address"/></td>
</tr>
</table>
<div align="center">You can also click on any property in the city on the map below to get the same information:</div>
</div></div>
</div>
<div dojotype="dijit.layout.ContentPane" id="leftPane" region="left">
<div dojotype="dijit.layout.TabContainer">
<div dojoType="dijit.layout.ContentPane" id="legendPane" title="Legend" selected="true" >
<div class="MiniMargins"><div id="legendDiv"></div></div>
</div>
<div dojoType="dijit.layout.ContentPane" title="Turn on/off additional layers" >
<div class="MiniMargins">Choose Additional Boundaries to View on Map:<br>
<INPUT type="checkbox" name="C1" id="C1" onClick="changeSymbology()">Regional Activity Center<br>
<INPUT type="checkbox" name="C1" id="C2" onClick="changeSymbology()">Central City District Node<br>
<INPUT type="checkbox" name="C1" id="C3" onClick="changeSymbology()">Arts & Design Overlay District<br>
<INPUT type="checkbox" name="C1" id="C4" onClick="changeSymbology()">Neighborhood Redevelopment Overlay<br>
<INPUT type="checkbox" name="C1" id="C5" onClick="changeSymbology()">Biscayne Park Height Transition Zone<br></div>
</div>
</div>
</div>
<div id="mapDiv" dojotype="dijit.layout.ContentPane" region="center">
</div>
<div id="footer" dojotype="dijit.layout.ContentPane" region="bottom" >
City of North Miami
</div>
</div>
<div id="pleasewaitScreen" style="position:absolute;z-index:5;top:35%;left:42%;visibility:hidden">
<table bgcolor="#000000" border="1" bordercolor="#000000" cellpadding="0" cellspacing="0" height="110" width="300" id="table1">
<tr>
<td width="100%" height="100%" bgcolor="#E3E3E3" align="center" valign="middle">
<font class="GreenText"><b>Locating your address.<br>
please wait......</b></font><br />
</td>
</tr>
</table>
</div>
</body>