header{
    text-align: center;
}

#grid {
    border: 10px solid red;
    display: grid;
    grid-template-columns: repeat(3, 1fr);;
    width: 80vw;
    height: 80vw;
    max-width: 80vh;
    max-height: 80vh;
    margin: auto;
}

.grid-item {
    border: 1px solid black;
    background-color: white;
}

.grid-item:hover{
    cursor: pointer;
}

#score {
    text-align: center;
    width: 100%;
    font-size: 2em;
    font-weight: bold;
    padding: 10px;
}