#popup-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    overflow-y: auto;
}
#popup-overlay.is-visible {
    display: flex;
}
#popup-overlay .popup-box {
    background: #fff;
    padding: 40px;
    max-width: 640px;
    width: 90%;
    position: relative;
    border-radius: 6px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    margin: auto;
}
@media screen and (max-width: 680px) {
    #popup-overlay {
        align-items: flex-start;
    }
    #popup-overlay .popup-box {
        margin: 20px auto;
        padding: 24px 16px;
        width: 95%;
        border-radius: 4px;
    }
}
#popup-overlay .popup-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 28px;
    line-height: 1;
    background: none;
    border: none;
    cursor: pointer;
    color: #666;
}
#popup-overlay .popup-close:hover {
    color: #000;
}
.redhead {
	color: #c00;	
}
#main #popup-overlay .redhead strong {
	color: #c00;
}
#main #popup-overlay .redhead h2 {
    color: #c00;
    margin-top: 0;
    margin-bottom: 0.5em;
    font-size: 1.3em;
    font-weight: 700;    
}
#main #popup-overlay h3 {
    font-size: 1.3em;
    font-weight: 700;    
}