main {
    position: relative;
}

main > section {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: rgba(200,200,200,.35);
    display: none;
    justify-content: center;
    align-items: center;
}

main > section > article {
    width: 500px;
    height: 70vh;
    background-color: #FFF;
    z-index: 50;
    border: 2px solid #298acd;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-direction: column;
    padding: 20px;
    position: relative;
    overflow-y: auto;
}

main > section > article > p  {
    display: flex;
    justify-content: center;
    align-items: center;
}

.alert_title {
    display: inline-block;
    padding: 10px 80px;
    font-size: 30px;
    background-color: #298acd;
    color: white;
    border-radius: 30px;
}
.alert_title:before {
    content: attr(data-front);
}

main > section > article >section {
    width: 100%;
    height: calc(100% - 70px);
    margin-top: 20px;
}

main > section > article >section:empty {
    background-color: #eee;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #298acd;
    font-size: 30px;
    font-weight: bolder;
}

main > section > article >section:empty:before {
    content: "현재 발생한 알림이 없습니다";
}

main > section > article > button.close_btn {
    position: absolute;
    width: 25px;
    height: 25px;
    top: 20px;
    right: 20px;
    background-color: #fff;
    background-image: url(../images/icon/close_btn.png);
    background-size: contain;
}