nextcloud-server/core/css/jquery.ocdialog.css

.oc-dialog {
	background: #fff;
	color: #333;
	border-radius: 3px; box-shadow: 0 0 7px #888;
	padding: 15px;
	z-index: 10000;
	font-size: 100%;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
	min-width: 200px;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	max-height: calc(100% - 20px);
	max-width: calc(100% - 20px);
	overflow: auto;
}
.oc-dialog-title {
	background: #fff;
	margin-left: 12px;
}
.oc-dialog-buttonrow {
	position: relative;
	display: block;
	background: transparent;
	right: 0;
	bottom: 0;
	padding: 10px;
	padding-bottom: 0;
	box-sizing: border-box;
	width: 100%;
	background-image: linear-gradient(rgba(255, 255, 255, 0), rgba(255, 255, 255, 1));
	border-bottom-left-radius: 3px;
	border-bottom-right-radius: 3px;
}
/* align primary button to right, other buttons to left */
.oc-dialog-buttonrow.twobuttons button:nth-child(1) {
	float: left;
}
.oc-dialog-buttonrow.twobuttons button:nth-child(2) {
	float: right;
}

.oc-dialog-buttonrow.onebutton button {
	float: right;
}
.oc-dialog-buttonrow:after {
	visibility: hidden;
	display: block;
	font-size: 0;
	content: " ";
	clear: both;
	height: 0;
}

.oc-dialog-close {
	position: absolute;
	top: 0;
	right: 0;
	padding: 25px;
	background: url('../img/actions/close.svg') no-repeat center;
}

.oc-dialog-dim {
	background-color: #000;
	opacity: .20;
	z-index: 999;
	position: fixed;
	top: 0; left: 0;
	width: 100%; height: 100%;
}

.oc-dialog-content {
	width: 100%;
}