div.lang_chooser {
    margin-top: 10px;
    margin-bottom: 10px;
    overflow: hidden;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}

div.lang_chooser button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
}

div.lang_chooser button:hover {
    background-color: #ddd;
}

.button {
    margin-top: 15px;
    margin-bottom: 15px;
}

.tab_content {
    display: none;
}

.formular_frame {
    display: none;
}

.image {
    display: flex;
    justify-content: center;
}

.warning {
    color: red;
    margin-top: 15px;
    margin-bottom: 15px;
    display: block;
}