body,p{margin:0;padding:0;}
a{color:#000;text-decoration:none;}
a:hover{text-decoration:underline;}
.imac{
	margin-top:4vh;
	height:92vh;
	border-top:1px solid rgba(0,0,0,0);
	background:url("../images/imac-27-silver_h1080.png") top center no-repeat;
	background-size:contain;
}
.screen{
	margin:0 auto;
	margin-top:calc(251/4540*92vh);
	height:calc(2879/4540*92vh);
	width:calc(5120/4540*92vh);
	overflow:auto;
}

.imac-h{
	margin-top:0;
	height:calc(4540/5640*100vw);
}
.imac-h .screen{
	margin-top:calc(251/5640*100vw);
	height:calc(2879/5640*100vw);
	width:calc(5120/5640*100vw);
}

.content{
	font-size:16px;
	font-family:tahoma,arial,'Hiragino Sans GB','Microsoft YaHei',sans-serif;
	line-height:1.75;
	padding:1em 1.75em;
}
.content .title{
	font-size:2em;
	margin-bottom:.25em;
}
.content .title a{
	color:#0486DE;
}

.btn-round{
	background-color:#fff;
	box-shadow:0px 1px 1px rgba(0,0,0,0.15);
	border:1px solid rgba(0,51,102, 0.5);
	padding:7px 14px;
	font:14px/1 arial;
	border-radius:14px;
	display:inline-block;
	text-decoration:none;
}
.btn-round:hover{
	background-color:#036;
	color:#fff;
	text-decoration:none;
}
.btn-round{
	margin:1.75em 0;
}