@import url(http://fonts.lug.ustc.edu.cn/css?family=Droid+Sans:700);

/* counters */

body {
  counter-reset: sections boxes;
}

section {
  counter-increment: sections;
}

section::before {
  content: 'Section ' counter(sections);
}

.box {
  counter-increment: boxes;
}

.box::before {
  content: counter(boxes, upper-roman);
}

/* the rest is just to make things pretty */

body {
  margin: 32px;
  font: 700 32px/1 'Droid Sans', sans-serif;
  color: #fff;
  background-color: #473f58;
}

h1 {
  margin: 0 0 32px;
  font-size: 48px;
}

section {
  margin-bottom: 16px;
  padding: 16px;
  border-radius: 4px;
  overflow: hidden;
  background-color: rgba(255, 255, 255, .1);
}

section::before {
  display: block;
  margin: 0 0 8px 8px;
}

.box {
  float: left;
  width: 96px;
  height: 64px;
  margin: 8px;
  border-radius: 4px;
  line-height: 64px;
  text-align: center;
  font-size: 28px;
  background-color: rgba(255, 255, 255, .2);  
}