/* Reset and base */
body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
    background-color: black;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

/* Game grid */
.tela {
    width: 80vmin;   /* keeps it square on any screen */
    height: 80vmin;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 10px;
    margin-bottom: 30px;
}

/* Color buttons */
.redbutton {
    background-color: red;
    height: 100%;
    width: 100%;
    border-radius: 5px;
    cursor: pointer;
}

.bluebutton {
    background-color: blue;
    height: 100%;
    width: 100%;
    border-radius: 5px;
    cursor: pointer;
}

.greenbutton {
    background-color: green;
    height: 100%;
    width: 100%;
    border-radius: 5px;
    cursor: pointer;
}

.yellowbutton {
    background-color: yellow;
    height: 100%;
    width: 100%;
    border-radius: 5px;
    cursor: pointer;
}

/* Start button */
.startbutton {
    background-color: white;  
    color: black;
    border: none;
    border-radius: 999px;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

.startbutton:hover {
    background-color: #ddd;
}