*
{
    margin:0;
    padding:0;
}
body {
}
header 
{
    margin-left:10px;
    margin-top:10px;
  background:blue;
    width:255px;
    height:30px;
       text-align:center;
    border-color:Black;
    border-style:solid;
    border-width:thin;
 -webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
color:white;
 


}
#Button1,Button2
{
    margin-left:10px;
    margin-top:3px;
}
#mas, #mas2,#mas3 
{
     margin-left:10px;
    margin-top:3px;
     width:255px;
    font-size:medium;
    background-color:Gray;
    border-color:Black;
    border-style:solid;
    border-width:1px;
    color:yellow;
    text-align:center;
    
   
}
#GridView1, #GridView2
{
    margin-left:10px;
}

.btn 
{
    margin-left:14px;
       margin-top:3px;
  background: #3498db;
  background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
  background-image: -moz-linear-gradient(top, #3498db, #2980b9);
  background-image: -ms-linear-gradient(top, #3498db, #2980b9);
  background-image: -o-linear-gradient(top, #3498db, #2980b9);
  background-image: linear-gradient(to bottom, #3498db, #2980b9);
  -webkit-border-radius: 28;
  -moz-border-radius: 28;
  border-radius: 28px;
  font-family: Arial;
  color: #ffffff;
  font-size: 12px;
  padding: 10px 20px 10px 20px;
  text-decoration: none;
}

.btn:hover {
  background: #3cb0fd;
  background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
  background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
  text-decoration: none;
}
nav
{
    margin-left:10px;
     width:255px;
     height:100px;
     background:grey;
     border-style:solid;
     border-width:thin;
     border-color:Black;
     
}
ul
{
    list-style:none;
    margin-top:5px;
}