header{
    display: block;
    margin: 0px auto;
    width: 100%;
    text-align: center;

}
header h1{
    font-family: Arial;
    font-size: 30px;
    font-weight: bold;

}

header #newgamebutton{
    display: block;
    margin: 0px auto;

    width: 100px;
    padding: 10px 10px;
    background-color: #8f7a66;
    font-family: Arial;
    color: white;
    border-radius: 10px;
    text-decoration: none;
}
header #newgamebutton:hover{
    background-color: #9f8b77;
}
header p{
    font-family: Arial;
    font-size: 20px;
    margin: 5px auto;
}
#grid-container{
    width: 460px;
    height: 460px;
    padding: 50px;
    margin:5px auto;
    background-color: #bbada0;

    border-radius: 10px;
    position: relative;
}

.grid-cell{
    width: 100px;
    height: 100px;
    border-radius: 6px;
    background-color:#ccc0b3;

    position: absolute;
}

.number-cell{
    border-radius: 6px;
    width: 100px;
    height: 100px;
    font-family: Arial;
    font-weight: bold;
    font-size: 60px;
    line-height: 100px;
    text-align: center;

    position: absolute;
}