/* 内外边距通常让各个浏览器样式的表现位置不同 */
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,div,fieldset,legend,input,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section {
	margin:0;
	padding:0;
}
body {
	position:relative;
	z-index:1000;
}
div {
	position:absolute;
	z-index:2000;
	width:100px;
	height:100px;
}
.drag {
	background-color:blue;
	top:0;
	left:0;
}
.hit {
	background-color:red;
	top:100px;
	left:200px;
}