#sellonb_msgwin {
	position:fixed;
	top:0;
	left:0;
	width:100%; 
	height: 100%;
	background-color: rgba(0,0,0,0.15);

	overflow-y: scroll;
	z-index: calc(var(--zindex-nav) + 1) !important;

	display: flex;
	align-items: center;
	justify-content: center;
}

#sellonb_msgwin > div:first-child {
	background-color: white;
	border-radius: 6px;
    position: relative;
}

#sellonb_msgwin div.msg_heading {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 150px;
    background-color: #f5f5f5;
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
}

#sellonb_msgwin div.msg_body {
    padding-top: 160px !important;
}