.know-class  {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 4px;
    font-weight: bold;
}

.btn-know-class:hover {
    background-color: #45a049;
    cursor: pointer;
}

.dont-know-class {
    background-color: #f44336;
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 4px;
    font-weight: bold;
}

#btn-dont-know:hover {
    background-color: #d32f2f;
    cursor: pointer;
}

.answer-button-container {
    display: flex;
    justify-content: space-around;
}

#card-word {
    position: relative;
    left: 47.5%;
    font-style: bolder;
}

#def-block-div {
    display: none;
}