相关疑难解决方法(0)

body {
  padding: 20px;
}

header {
  width: 240px;
  background-color: #BCED91;
}

header:after {
  content: " ";
  display: block;
  position: relative;
  width: 240px;
  bottom: -15px;
  height: 15px;
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAPCAYAAACWV43jAAAAw0lEQVRIx83RsQ3CMBCF4T83AZKLVOmyBa1HSIlXwKySGaDOBClZAToWQIpETQONyxAS+2J4pe9knd5X9EP7QicPYAsUwBnYaHwqSsd1QGmNv1rjL0AZ3pJTKDTorPGnsUE/tDvg+KsG70D96TiAMKvDbtYDO6Cyxt++LYadKpY8hthNtTaVGHLRJJ3R5mJy0SbVJp9D7FJaSyWXNUk1yGVt0lTyMWK3ZmtLySUnaQy55CZdSi7AHmis8U/+JOGWBji8AaYPVy6VELZvAAAAAElFTkSuQmCC) repeat-x;
}

img {
  margin-top: 50px;
}

<header>
  <br />
  <br />
  <br />
  <br />
</header>

<img src="http://i.imgur.com/qKsVr.png" />