.vocabulary-tool {
    max-width: 600px;

    margin-left: auto;
    margin-right: auto;

    margin-top: 100px;
}

.vocabulary-date {
    text-align: center;
}

.vocabulary-cards {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    justify-items: center;
    align-items: center;

    text-align: center;

    margin-top: 50px;
    margin-bottom: 100px;

    perspective: 1000px;
}

.vocabulary-card {
    width: 130px;
    height: 190px;

    border: 1px solid;

    border-radius: 5px;

    background-color: var(--color-accent);

    transition: transform 0.8s;
    transform-style: preserve-3d;
}

  
.vocabulary-card:hover {
    transform: rotateY(180deg);
}
  
.vocabulary-front, .vocabulary-back {
    display: grid;
    align-items: center;
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}
  
.vocabulary-front {
    background-color: var(--color-accent);
}
  
.vocabulary-back {
    background-color: var(--color-accent);
    transform: rotateY(180deg);
}