.grid {
    width: 70vh;
    height: 70vh;
    margin-left: auto;
    margin-right: auto;
    margin-top: 12vh;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    border-width: 1px;
    border-style: solid;
}

.grid-square {
}

.grid-square input {
    height: 100%;
    width: 100%;
    border-width: 1px;
    border-style: solid;
    font-size: 10vw;
    text-align: center;
    font-family: arial;
}