How to take notification box in center in both mobile and desktop by css

Question

Please help 

Answer 1

 css file :: for on site notification  donut theme 

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.qa-nav-user {
	position:relative;
	white-space:normal;
}
#osnbox {
	position:relative;
	display:inline-block;
	text-align: left;
}
.nfyWrap {
	position: absolute;
	top: 31px;
  right: 10px;
	width: 260px;
	background: #fefefe;
	padding: 0;
	font-family: Arial,Helvetica,sans-serif;
	box-shadow: 4px 4px 7px #ababab;
	z-index: 999; 
}
.nfyWrap .nfyTop {
	font-size: 11px;
	line-height: 12px;
	padding: 5px;
	color: #333;
	background: #eaeaea;
	border: 1px solid #CCC;
	border-radius: 3px 3px 0 0;
}
.nfyWrap .nfyContainer {
	width: 100%;
	overflow-y: auto;
	padding: 0;
	height: 240px;
}
.nfyWrap .nfyFooter {
	padding: 5px;
	background: #fefefe;
	text-align: right;
	font-size: 10px;
}
.nfyWrap .nfyFooter a {
	color: #aaa;
	cursor: pointer;
}
.nfyWrap .itemBox, .nfyWrap .itemBox-new {
	width: 100%;
	float: left;
	margin: 0;
	padding: 3px 0 12px 0;
	border-bottom: 1px dashed #CCC;
}
.nfyWrap .itemBox-new {
	background: #FE8;
}
.nfyWrap .itemBox:hover {
	background: #EEE;
}
.nfyWrap .itemBoxNew {
	background-color: #ffffe2;
}
.nfyWrap .nfyItemLine {
	display:inline-block;
	width: 210px;
	font-size: 12px;
	color: #555;
}
.nfyWrap .nfyItemLine a {
	font-size: 12px;
	color: #44A;
	text-decoration: none;
}
.nfyWrap .nfyItemLine p {
	display:inline-block;
	margin: 0 0 2px 0;
	line-height: 1.2;
}
.nfyWrap .siteLink {
	font-size: 9px !important;
	text-decoration: none;
	font-weight: normal !important;
	margin-bottom: 4px;
	display: inline-block;
}
.nfyWrap .nfyItemLine a:hover {
	color: #55F;
}
.nicon {
	display: inline-block;
	width: 16px;
	height: 16px;
	margin: 4px 4px 0 5px;
	vertical-align: top;
}
.nicon.nanswer {
	background:url(icons.png) no-repeat 0 0;
}
.nicon.ncomment {
	background:url(icons.png) no-repeat 0 -16px;
}
.nicon.nvoteup {
	background:url(icons.png) no-repeat 0 -32px;
}
.nicon.nvotedown {
	background:url(icons.png) no-repeat 0 -48px;
}
.nicon.nbestanswer {
	background:url(icons.png) no-repeat 0 -64px;
}
.nicon.nmessage {
	background:url(icons.png) no-repeat 0 -80px;
}
.nicon.nwallpost {
	background:url(icons.png) no-repeat 0 -96px;
}
.nfyWhat {
	padding-top:3px;
}
.nfyTime {
	color: #888;
	display:block !important;
}
.qa-history-event-nill {
	display: inline-block;
	width: 15px;
	height: 15px;
	overflow: hidden;
	border: 0;
	border-radius: 10px;
	box-shadow: 0 1px 1px #999;
	text-align: center;
	background-color: #999;
	font-style: italic;
	font-weight: bold;
	color: #FFF;
	cursor: pointer;
}
.osn-new-events-link {
	position: relative;
}
.osn-new-events-link:hover {
	text-decoration:none !important;
}
/* notifybub (N) */
.ntfy-event-new, .ntfy-event-nill {
	background-color: #FF5;
	color: #000;
	border: 1px solid #EEEE00;
	border-radius: 2px;
	cursor: pointer;
	font-size: 11px;
	font-weight: bold;
	padding: 3px 4px;
	vertical-align: top;
	
}
.ntfy-read, .ntfy-event-nill {
	background: #EEE;
	border: 1px solid #DDD;
	color: #555;
}
#nfyReadClose {
	float:right;
	cursor:pointer;
	color:#333;
}

/* snow flat theme */
.qam-account-items-wrapper #osnbox {
	float: left;
	margin-left:-30px;
}
.qam-account-items-wrapper .ntfy-event-new, .qam-account-items-wrapper .ntfy-event-nill {
	padding: 4px 7px;
}
.qam-account-items-wrapper .nfyWrap {
	left:-20px;
	top:30px;
}
.qam-account-items-wrapper .nfyWrap, .qam-account-items-wrapper .nfyWrap .nfyContainer p {
	/* disable snow flat's global border-box */
	box-sizing: content-box !important;
}
/* donut theme */


/* smartphones */