html, body{
     width: 100%;
     margin: 0;
     background-color: lightgray;
}

body{
     width: 800px;
     margin: 0 auto;
     background-color: antiquewhite;
}

h1{
         text-align: center;
          margin: 0;

}

ul{
        margin-left: 60px;
        padding-left: 0;

}

li{
        display: inline-block;
        width: 150px;
        height: 40px;
        background-color: orange;
        border: 1px solid white;
        border-radius: 5px;
        text-align: center;
}

li{
       padding-top: 10px;
       margin: 10px;
}


li a{
   margin: 0;
   padding: 5px 50px;
   width : 150px;
   height: 40px;
}

li:hover{ border-color: red;}

li:active{ 
 position: relative; top: 3px; 
}

#btn{
 margin-left: 44%;
 font-size:30px;
}