.library__stage_num {
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    display: inline-block;
    width: 80px;
    height: 80px;
    border-radius: 80px;
    background: #FF4C00;
    color: #FFFFFF;
    font-weight: bold;
    font-size: 21px;
    line-height: 24px;
    text-align: center;
    padding: 28px;
    margin-bottom: 30px;
}
.library__common-question_text {
    padding: 18px 0 76px 0;
    border-bottom: 1px solid #EBEBEB;
}
.hidden {
    display: none;
}
.btn {
    display: inline-block;
    text-transform: uppercase;
    font-weight: bold;
    text-align: center;
}