*{
	padding: 0;
	margin: 0;
}
 
header{
    display:block;
    margin:0 auto;
    width:500px;
    text-align:center;
}
 
header h1{
    font-family:Arial, Helvetica, sans-serif;
    font-size:60px;
    font-weight:bold;
    margin-top: 20px;
    margin-bottom: 20px;    
}
 
header #newgamebutton{
    width:100px;
    padding:10px;
    background:#8f7a66;
    font-family:Arial, Helvetica, sans-serif;
    color:white;
    border-radius:10px;
    text-decoration:none;
    
}
 
header #newgamebutton:hover{
    background:#9f8b77;
}
 
header p{
    font-family:Arial, Helvetica, sans-serif;
    font-size:25px;
    margin:20px auto;
}
 
#grid-container{
    width:460px;
    height:460px;
    padding:20px;
    margin:40px auto;
    background:#bbada0;
    border-radius:10px;
    position:relative;
}
 
.grid-cell{
    width:100px;
    height:100px;
    border-radius:6px;
    background:#ccc0b3;
    position:absolute;
}
 
.number-cell{
    width:100px;
    height:100px;
    border-radius:6px;
    line-height:100px;
    font:Arial, Helvetica, sans-serif;
    font-size:50px;
    font-weight:bold;
    text-align: center;
    position:absolute;
}
#gameover{
    background-color:black;
    color: white;
    font-family:Arial, Helvetica, sans-serif;
    font-size:60px;
    position: absolute;
    top:45%;
    left:42%;
    width:250px;
    text-align:center;
    display: none;
}