Label1.aspx font size:
View Sample
<head>
<title>Label Control Example</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
void setLabelText ( object src, EventArgs e ) {
   myLabel.Text = myTextBox.Text;
}
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc -->
<div class="header"><h2>Label Control Example</h2></div>

<!-- #include virtual="~/shared/viewsrc_top.inc" -->
<hr size=1 width=92%>

<div align="center">
<form runat="server">

   <p><asp:textbox id="myTextBox" text="Copy this text to the label" width="200px" runat="server" />

   <asp:button text="Copy" onClick="setLabelText" runat="server" />

   <p><b><asp:label id="myLabel" text="This is some text in a Label control." runat="server" /></b>

</form>
</div>

<hr size=1 width=92%>
<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>