* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: black;
}

.divv {
    padding: 50px;
    border: 1px solid rgb(118, 118, 118);
    cursor: pointer;
    background: gray;
}

.divv0 {
    padding: 50px;
    border: 1px solid rgb(118, 118, 118);
    cursor: pointer;
    background: white;
}

.mainDiv1 {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.mainDiv {
    width: 400px;
    display: grid;
    gap: 2px;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

button {
    background: yellow;
    padding: 5px;
}