* {
    text-align: center;
    margin: auto;
}

h1 {
    margin: 20px auto 20px auto;
}

#grid-container {
    width: 500px;
    height: 500px;
    border: 5px solid #000000;
    display: grid;
    grid-template-columns: repeat(var(--grid-size), 1fr);
}

.grid-item {
    width: 50px;
    height: 50px;
    background-color: black;
}

.button {
    box-sizing: border-box; 
    margin: 10px auto;
    padding: 10px 20px;
    background-color: #000000;
    color: #ffffff;
    font-size: 16px;
    cursor: pointer;
    width: 500px;
}

#results {
    margin-top: 20px;
    font-size: 18px;
}