Create a Stylish Callout Box with CSS

I recently needed to create a callout box using only CSS. I was able to do this using the css :before and :after Pseudo-elements. The trick was adding the border color to the side I wanted the triangle to point towards. Here is the CSS.

#comment{
 position: relative;
 padding: 10px;
 width: 150px;
 height: 150px;
 background-color: #F0F0F0;
 border: 1px solid #D0D0D0;
 -webkit-box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
 -moz-box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
 box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
}
 #comment:after, #comment:before {
  border: solid transparent;
  content: ' ';
  height: 0;
  position: absolute;
  width: 0;
 }
 #comment:after {
  border-color: rgba(240, 240, 240, 0);
  border-bottom-color: #F0F0F0;//Change this to change direction of triangle
  border-width: 9px;
  top: -18px;
  left: 7px;
 }
 #comment:before {
  border-color: rgba(208, 208, 208, 0);
  border-bottom-color: #D0D0D0;//Change this to change direction of triangle
  border-width: 10px;
  top: -20px;
  left: 6px;
 }

Here is a fiddle that shows what this produces. I also found this great resource online that mimics what I am producing here.

I actually liked Simon's approach to this and thought it was worth writing down his code for future reference. Just in case his site is ever taken down.

.arrow_box {
 position: relative;
 background: #88b7d5;
 border: 4px solid #c2e1f5;
}
.arrow_box:after, .arrow_box:before {
 bottom: 100%;
 border: solid transparent;
 content: " ";
 height: 0;
 width: 0;
 position: absolute;
 pointer-events: none;
}

.arrow_box:after {
 border-color: rgba(136, 183, 213, 0);
 border-bottom-color: #88b7d5;
 border-width: 30px;
 left: 50%;
 margin-left: -30px;
}
.arrow_box:before {
 border-color: rgba(194, 225, 245, 0);
 border-bottom-color: #c2e1f5;
 border-width: 36px;
 left: 50%;
 margin-left: -36px;
}