.button-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px;
}
.button-column {
    display: flex;
    flex-direction: column;
}
button {
    margin: 5px;
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
    background-color: #4A90E2;
    color: white;
    border: none;
    border-radius: 10px;
    transition: background-color 0.3s;
}
button:active {
    background-color: #357ABD;
}
.selected {
    background-color: green !important;
}
.incorrect {
    background-color: red !important;
}