body {
    font-family: Arial, sans-serif;
    text-align: center;
}

button {
    cursor: pointer;
    padding: 8px 16px;
    font-size: 16px;
}

#quiz-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 20px auto;
}

#next-button {
    display: block;
}

#back-button {
    display: none;
}


.input-large {
    width: 200px;
    height: 40px;
}

.input-radio {
    width: 100;
}

.input-small {
    width: 40px;
    height: 40px;
}

#username-container,
#question-count-container {
    margin-bottom: 20px;
}

#question-count-container {
    margin-top: 10px;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

#start-button-container {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

#start-quiz {
    margin-top: 10px;
    padding: 10px 20px;
    background-color: #007BFF;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#start-quiz:hover {
    background-color: #0056b3;
}

label {
    margin-bottom: 20px;
}

#category-selection-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 20px;
    max-width: 600px;
    margin: 0 auto;
    padding: 10px;
}

#category-selection-container label {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
    margin-bottom: 0;
}


#start-quiz:disabled {
    background-color: #ccc;
    color: #666;
    cursor: not-allowed;
}

#share-session {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
}

#share-session:hover {
    background-color: #45a049;
}

#calibration-graph {
    display: block;
    margin: 20px auto;
    max-width: 100%;
    height: auto;
}