.login_popup{
	position:absolute;
	width: 30%;
	height:260px;
	left: 35%;
	top: 200px;
	background-color:white;
	display:none;
	z-index:999999;
}

.login_form{
	position:relateive;
	width:99%;
	height:100%;
}

@media only screen and (max-width: 960px) {
.login_popup{
	position:absolute;
	width: 280px;
	height:260px;
	left: calc(50% - 140px);
    left: -moz-calc(50% - 140px);
    left: -webkit-calc(50% - 140px;
}
}