*{
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
.header{
	background: #eee;
	padding: 20px;
}
.header img{
	height: 60px;
}
.sticky_img{
	height: auto;
	position: sticky;
	top: 0;
	width: 100%;
}
.scroll_area{
	background: #ccc;
	margin-top: 60px;
	height: 1000px;
	padding: 40px;
}