jswindow.css

body {
	overflow: hidden;
}

.window {
	resize: both;
	overflow: hidden;
	position: absolute;
	border: 2px solid darkgrey;
	margin: 0px;
	background-color: #DDD;
	cursor: default;
	min-width: 20px;
	min-height: 20px;
	padding: 0px;
	z-index: 1000;
}

.windowbar {
	font-family: sans-serif;
	user-select: none;
	width: calc(100% - 4px);
	padding: 2px;
	height: 16px;
	line-height: 16px;
	color: black;
	background-color: lightblue;
	background-image: url("bar.png");
	font-size: 12px;
	border-bottom: 2px solid darkgrey;
	overflow: hidden;
}

.windowicon, .windowtitle, .windowclose {
	display: inline-block;
}

.windowicon {
	background-repeat: no-repeat;
	background-position: center;
	background-size: contain;
	width: 16px;
	height: 16px;
	position: absolute;
	top: 2px;
	left: 2px;
}

.windowtitle {
	position: relative;
}

.windowicon+.windowtitle {
	left: 18px;
}

.windowclose {
	position: absolute;
	top: 2px;
	right: 2px;
	width: 14px;
	height: 14px;
	line-height: 14px;
	text-align: center;
	background-color: tomato;
	border: 1px outset lightgray;
}

.windowclose:active {
	border-style: inset;
}

.windowcontent {
	width: 100%;
	height: calc(100% - 22px);
	overflow: auto;
}