Stop Style Class in asp.net

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ASP.NET

CSS

i m working asp.net C# with vs10

It creates Style Css Automatically I want to stop it
How Should i stop it not to let it create automatically????

(eg)

<style type="text/css">
     .style3
     {
         width: 0px;
     }
     .style7
     {
         width: 0px;
     }
     .style8
     {
         width: 0px;
     }
     .style10
     {
         width: 0px;
     }
     .style11
     {
         width: 0px;
     }
     .style20
     {
         width: 175px;
     }
     .style24
     {
         width: 0px;
     }
     .style25
     {
         width: 0px;
     }
     .style26
     {
         width: 0px;
     }
     .style28
     {
         width: 0px;
     }
     .style37
     {
         width: 165px;
     }
     .style40
     {
         width: 0px;
     }
     .style51
     {
         width: 0px;
     }
     .style57
     {
         width: 0px;
     }
     .style58
     {
         width: 0px;
     }
     .style59
     {
         width: 0px;
     }
     .style60
     {
         width: 159px;
     }
     .style62
     {
         width: 95px;
     }
     .style63
     {
         width: 124px;
     }
     .style64
     {
         width: 114px;
     }
 </style>