How to remove margin from GridView cell using CSS in ASP.Net

see below is cell's code:

<asp:TemplateField ItemStyle-Width="91px" ItemStyle-VerticalAlign="Middle" >
       <ItemTemplate>                          
              <div id="DviewM">
  
              </div>
              <div id="DviewM1">

              </div>
        </ItemTemplate>
</asp:TemplateField>

and css

#DviewM 
{
    float:right;
    width:100px;
    height:55px;
    background-color:#989896;
} 

#DviewM1 
{
    float:right;
    width:100px;
    height:32px;
    background-color:#fcb906;
}

and result is below image:

as you see I point with red arrow it put margin for cell right left button top I want it doesn't have any margin