#popup_container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    z-index: 9999;
}

#popup_container .popup_content {
    position: relative;
    width: calc(100% - 100px);
    max-width: 650px;
    max-height: calc(100% - 100px);
    background: #fff;
    padding: 1rem;
    box-shadow: 0px 2px 8px #222;
}

#popup_container .popup_content .close {
    position: absolute;
    width: 30px;
    height: 30px;
    top: -30px;
    right: -30px;
    font-size: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    cursor: pointer;
}

#popup_container .popup_content h3 {
    font-size: 1.5rem;
    line-height: 1.3;
}

#popup_container .popup_content > * {
    margin-bottom: 0.75rem;
}