Certain Buttons not displaying on IE11

See more:

CSS

.NET

HTML

.NET4.5

IE11

Hi,
We recently upgraded our application from .net 2.0 to 4.5. As a result of which we had to use IE11. The problem I am facing is that certain buttons and an address which is in the Master Page in the application do not show up on the page. It gets displayed on if I turn on Compatibility View which is not recommended. It uses a Css Class bluebutton which is being used by other buttons too and they are getting displayed on the page.
Below is the css class,

input.bluebutton
{
   font-size:.875em;
   font-family:Arial;
   color:white;
   width:auto;
   height:22px;
   background: #606060 url(../../images/BlankBlueButton61x22RepeatX.gif) 0px 0px repeat-x scroll;
   border:1px none solid;
   border-collapse: collapse;
   padding: 0px 0.5em 0px 0.5em;
}

Below is the HTML tag of one of the pages,

<asp:Button ID="ButtonSearch" runat="server" CssClass="bluebutton" CausesValidation="false"
                               meta:resourcekey="ButtonSearch" OnClick="ButtonSearchClick" />

Please let me know how do i go about this and get it working?
Thanks in advance! :)