.cislo {
    width: 40px;
    height: 40px;
    border: 1px solid #000;
    border-radius: 5px;
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    margin: 10px;
    padding: 10px;
    position: absolute;
}

.container {
    position: absolute;
}

#compute-btn {
    position: absolute;
    left: 10px;
    top: 10px;
    width: 150px;
    height: 40px;
    padding: 8px 16px;
    font-size: 16px;
    cursor: pointer;
}

#next-level-btn {
    position: absolute;
    left: 10px;
    top: 60px;
    width: 150px;
    height: 40px;
    padding: 8px 16px;
    font-size: 16px;
    cursor: pointer;
}

#next-level-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}