#button_container_options,
#button_container_levels,
#report_container,
#report_form_container,
#report_characters_container,
#report_pinyin_container,
#report_english_container,
#report_bug_container {
    display: none;
}

.option_row {
    padding: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: no-wrap;
    gap: 30px;
    max-width: 70%;
    padding: 0px;
}
.flashcard_button {
    border-radius: 50px;
    z-index: 500;
    padding: 10px;
    background-color: var(--elementBG);
    width: 60px;
    height: 60px;
    z-index: 500;
    font: var(--normalFont);
}

.flashcard_icon {
    font-size: 3.2rem;
    margin-top: 2px;
}
.level_display_column {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}
.selector_button {
    font-size: var(--buttonFontSize);
    transition: color 0.2s, transform 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0px 4px;
}
.selector_text {
    font-size: 2.5rem;
    margin-top: 1px;
}

.back {
    font-size: 2rem;
}
.back_row{
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 25px;
}
.knowledge_highlight {
    border: var(--highlightBorder);
    background-color: var(--highlightBG);
}
#play_icon_button_flashcards {
    position: absolute;
    bottom: 120px;
    right: 20px;
    width: 20px;
    height: 20px;
    border-radius: 50px;
    z-index: 500;
    display: none;
    padding: 20px;
    border: none;
}
.option_button_container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}