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Trouble with CSS in ASP.NET 4.6

I have a project I've been working on for the past couple of months. Everything has been working fine up till today. When I came I noticed that all my button sizes were the same. I like to use the developer tools in Chrome to help debug my websites, and when I looked to see why the buttons weren't displaying properly; nothing seemed amiss. So will you please help me identify what is going on and how I should fix it?
Here is the .aspx code:
<div class="row section text-center">
<h2><%: Page.Title %> Page</h2><br />
<asp:Button ID="stReturnButton" runat="server" CssClass="stButton-lg" Text="Back to Training Portal" PostBackUrl="~/SST/SafetyTrainingPortal.aspx" />
<hr />
</div>
<div class="row col-xs-12 text-center">
<div class="col-xs-6 text-center">
<asp:Button ID="btnEditUpdate" runat="server" Text="Update Employee Certificates" CssClass="stButton-lg" PostBackUrl="~/SST/SUPERVISOR/UpdateCertificates.aspx"/>
</div>
<div class="col-xs-6 text-center">
<asp:Button ID="btnAddCerts" runat="server" Text="Update Employee Profile" CssClass="stButton-lg" PostBackUrl="~/SST/SUPERVISOR/UpdateEmployeeProfile.aspx" />
</div>
Here is what the page looks like now:
This is the CSS for the buttons:
.stButton {
width: 190px;
opacity: 1.0;
color: #0e4676;
background-color: #9FCF6E;
border-color: #357ebd;
padding: 5px;
margin-bottom: 5px;
border-radius: 10px;
box-shadow: #063156 3px 3px;
cursor: pointer;
user-select: none;
text-align:center;
}
.stButton-lg {
width: 325px !important;
opacity: 1.0;
color: #0e4676;
background-color: #9FCF6E;
border-color: #357ebd;
padding: 5px;
margin-bottom: 5px;
border-radius: 10px;
box-shadow: #063156 3px 3px;
cursor: pointer;
user-select: none;
text-align: center;
}
As you can see I have CSS for a normal button and CSS for a larger button. The larger button being what I'm targeting in my .aspx code. I include the "!important" at the end of the width because the buttons aren't displaying correctly; just to see if that would help... obviously it didn't. I've also tried inline styling and that doesn't work either. One important note, I've viewed the page in the following browsers: IE, Chrome, and Edge.
Anyway, here are the links in the Master Page with a view of the files in the folder structure of the project:
I commented out the placeholder for the Script.Render since I'm declaring the links directly above the placeholder. Also, having it uncommented did nothing for me as well.
I think I've covered it all, so if I've missed something please let me know and I'll include it. I appreciate all and any help that is given.

Thank you for your help. I found the answer however and hopefully this helps someone else. The problem was that another less experienced team member had changed the width for the input controls to Max-Width: 150px in the CSS (not shown in the pictures above). That tiny thing through me for almost an entire day, but at least it was found and corrected.
Thank you to those who helped or commented.

How to remove overflow: hidden using with telerik

Below is code before convert to HTML.I want to change overflow hidden.I found many way of CSS file. But couldn't find it and try using id to change css always no responding.
Telerik Code
<telerik:ReportViewer ID="ReportViewer1" runat="server" Height="800px"
Width="100%"></telerik:ReportViewer>
HTML View Through Browser Developer tools
<td id="TD_2">
<div id="TD2" style="overflow-y: auto; padding-left: 100px; width: auto; overflow-x:
hidden; position: inherit; height: 355px;">
<telerik:ReportViewer ID="ReportViewer1" runat="server" Height="800px"
Width="100%"></telerik:ReportViewer>
</td>

overflow : hidden hides content in placeholder object

I have an asp placeholder object, within a div.
<div id="contentMenu" class="contentMenu">
<asp:PlaceHolder ID="plhMenu" runat="server">
</asp:PlaceHolder>
<div id="divMenuImage" class="menuImage">
<asp:Image ID="imgMenu" runat="server" ImageUrl="images/menu.gif" />
</div>
</div>
the div uses the following css:
.contentMenu
{
color: #ffffff;
left: 0px;
margin-left: auto;
margin-right: auto;
margin-top: 0px;
position: absolute;
top: 85px;
width: 500px;
z-index: 1;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
}
Items in the menu are added to the placeholder using calls such as:
plhMenu.Controls.Add(btnArrow);
plhMenu.Controls.Add(btnCategory);
Using the text-overflow property in the css is supposed to crop the text and show ellipses.
However, when the property "overflow : hidden" is in the css, all the menu disappears. Remove that propery and the menu appears, but the text-overflow doesn't work (it seems that overflow : hidden is required).
Any help in sorting this out would be very much appreciated as I have spent hours trying to figure out what is going on.
Thanks in advance.

You don't have a height on your container div, if you are adding items to the placeholder dynamically after the page is first drawn, then they might not cause the div to grow vertically.
You could try using overflow-x: hidden;?

Image not displayed in chrome and firefox using "progid:DXImageTransform.Microsoft.AlphaImageLoader"

i am using "progid:DXImageTransform.Microsoft.AlphaImageLoader" to display iamge in div
My code is:
<body class="style_page" style="margin: 0px; background: white;" onload="onLoad()"
onunload="onUnload()" onresize="onResize()">
<div id="mediaPlayer" style="position: absolute; visibility: hidden;">
</div>
<div id="first" style="position: absolute; left: 50%; top: 0px; width: 800px; height: 600px;
font-size: 10pt; background: white;">
<div class="placeholder" style="left: 0%; top: 0%; width: 100%; height: 166%;">
<div class="outline" style="filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=scale, src='output6.jpg');">
</div>
</div>
</div>
It works fine in IE8 but doesn't work in Mozilla and google chrome
Plz help
Thanks

Mozilla, Opera, G.Chrome and other browsers doesn't support Microsoft filters for transform text and images(controls). I think that every brower producer use diferent method.
Try to find help on their sites, and you must write javascript functions to recognize browser whos load page you developed.

ASP.NET Display "Loading..." message while update panel is updating

Hello I am creating an ASP.NET/C# application
I have an update panel that takes time to update.
Is there a way to display a "Loading... Please Wait" Message during the time of the calculations?
Currently I am using AJAX panel animation fade in/fade out, to make the panel disappear while calculating and then reappear when done. But that is not very practical.
I need to display a message if possible.
Thank you for any help.
this is the code of my panel:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click"/>
</Triggers>
<ContentTemplate>
//Contents goes here
</ContentTemplate>
</asp:UpdatePanel>
And the Ajax Panel animation extender
<ajaxToolkit:UpdatePanelAnimationExtender ID="UpdatePanelAnimationExtender1" runat="server" TargetControlID="UpdatePanel1">
<Animations>
<OnUpdating>
<FadeOut Duration="1" Fps="20" />
</OnUpdating>
<OnUpdated>
<FadeIn Duration="2" Fps="20" />
</OnUpdated>
</Animations>
</ajaxToolkit:UpdatePanelAnimationExtender>

You can use code as below when
using Image as Loading
<asp:UpdateProgress id="updateProgress" runat="server">
<ProgressTemplate>
<div style="position: fixed; text-align: center; height: 100%; width: 100%; top: 0; right: 0; left: 0; z-index: 9999999; background-color: #000000; opacity: 0.7;">
<asp:Image ID="imgUpdateProgress" runat="server" ImageUrl="~/images/ajax-loader.gif" AlternateText="Loading ..." ToolTip="Loading ..." style="padding: 10px;position:fixed;top:45%;left:50%;" />
</div>
</ProgressTemplate>
</asp:UpdateProgress>
using Text as Loading
<asp:UpdateProgress id="updateProgress" runat="server">
<ProgressTemplate>
<div style="position: fixed; text-align: center; height: 100%; width: 100%; top: 0; right: 0; left: 0; z-index: 9999999; background-color: #000000; opacity: 0.7;">
<span style="border-width: 0px; position: fixed; padding: 50px; background-color: #FFFFFF; font-size: 36px; left: 40%; top: 40%;">Loading ...</span>
</div>
</ProgressTemplate>
</asp:UpdateProgress>

Awesome tutorial: 3 Different Ways to Display Progress in an ASP.NET AJAX Application

You can use the UpdateProgress control:
Also see:
ajax "loading" icon with UpdatePanel postbacks