.Vocabulary {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 18px;
    text-align: left;
}
.Vocabulary th, .Vocabulary td {
    border: 1px solid #dddddd;
    padding: 8px;
}
.Vocabulary th {
    background-color: #f2f2f2;
     text-align: center;
}
@media (max-width: 600px) {
    .Vocabulary {
        border: 0;
    }
    .Vocabulary thead {
        display: none;
    }
    .Vocabulary tr {
        display: block;
        margin-bottom: 10px;
    }
    .Vocabulary td {
        display: block;
        text-align: right;
        padding-left: 50%;
        position: relative;
    }
    .Vocabulary td::before {
        content: attr(data-label);
        position: absolute;
        left: 0;
        width: 50%;
        padding-left: 10px;
        font-weight: bold;
        text-align: left;
    }
}