body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: linear-gradient(135deg, #74ABE2, #5563DE);
    color: white;
}

nav a {
    margin: 0 10px;
    color: lime;
    font-weight: bold;
    text-decoration: none;
}

.tablon{
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 5px;
    justify-content: center;
    margin: 20px auto;
}

.celda{
    width: 100px;
    height: 100px;
    background-color: black;
    font-size: 2em;
    color: lime;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

button {
    background-color: red;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 1em;
    cursor: pointer;
    margin-top: 15px;
}