CSS3 实用技巧：制作三角形

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/* create an arrow that points up */
div.arrow-up {
  width:0px; 
  height:0px; 
  border-left:5px solid transparent;  /* left arrow slant */
  border-right:5px solid transparent; /* right arrow slant */
  border-bottom:5px solid #2f2f2f; /* bottom, add background color here */
  font-size:0px;
  line-height:0px;
}
 
/* create an arrow that points down */
div.arrow-down {
  width:0px; 
  height:0px; 
  border-left:5px solid transparent;
  border-right:5px solid transparent;
  border-top:5px solid #2f2f2f;
  font-size:0px;
  line-height:0px;
}
 
/* create an arrow that points left */
div.arrow-left {
  width:0px; 
  height:0px; 
  border-bottom:5px solid transparent;  /* left arrow slant */
  border-top:5px solid transparent; /* right arrow slant */
  border-right:5px solid #2f2f2f; /* bottom, add background color here */
  font-size:0px;
  line-height:0px;
}
 
/* create an arrow that points right */
div.arrow-right {
  width:0px; 
  height:0px; 
  border-bottom:5px solid transparent;  /* left arrow slant */
  border-top:5px solid transparent; /* right arrow slant */
  border-left:5px solid #2f2f2f; /* bottom, add background color here */
  font-size:0px;
  line-height:0px;
}