style.css

body{
    background-color: rgb(250, 242, 242);
}

.grid {
    display:flex;
    flex-wrap: wrap;
    height: 420px;
    width: 420px;
    background-color: rgb(0, 0, 0);
    margin: auto;
    justify-content: center;
    align-content: center;
}

.grid div{
    border: solid rgb(68, 65, 65) 2px;
    width: 100px;
    height: 100px;
    background-color: rgb(83, 200, 128);
    text-align: center;
    vertical-align: middle;
    line-height: 100px;
    font-weight: bold;
    font-size: 52px;
}

.scoreContainer {
    margin-top: 60px;
    font-weight: bold;
    text-align: center;
    font-size: 30px;
}

.header {
    font-size: 60px;
    margin-top: 50px;
    text-align: center;
    font-weight: bold;
}

.instructions{
    text-align: center;
    margin: auto;
}

#result{
    text-align: center;
    margin: auto;
}