.center {
    border: 1px black solid;
    display: block;
    height: 70%;
    margin: 100px auto auto auto;
    text-align: center;
    width: 60%;
}

div{
    font-size: 50px;
    font-family: 'Courier New', Courier, monospace;
    margin: 10px auto 10px auto;
}

header {
    font-family: 'Courier New', Courier, monospace;
    font-size: 80px;
}

.ball {    
    background-color: thistle;
    border: black solid 2px;
    border-radius: 50%;
    height: 80px;
    color: rgba(0, 0 ,0,0);
    display: inline-block;
    margin: 10px;
    width: 80px;
}

.ball-section{
    margin-top: 20px;
}

.placar {
    border: black 1px solid;
    display: block;
    height: 80px;
    width: 160px;
}

button{
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif ;
    font-size: large;
    height: 50px;
    width: 150px;
}