body {
    background-color: #111111;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.grid {
    display: grid;
    column-gap: 5px;
    row-gap: 5px;
}

.grid-item {
    background-color: #555555;
    width: 20px;
    height: 20px;
    border-radius: 5px;
    transition: all .5s ease-in-out;
}