Horizontal Related Post

Hi !

I use this css

#crp_related ul {
  list-style: none;
  float: left;
  margin: 0;
}
#crp_related li, #crp_related a {
  float: left;
  overflow: hidden;
  position: relative;
  text-align: center;
}
#crp_related li {
  margin: .9em;
  border: 1px solid #ddd;
  padding: 6px;
}
#crp_related li:hover {
  background: #eee;
  border-color: #bbb;
}
#crp_related a {
  width: 150px;
  height: 150px;
}
#crp_related a:hover {
  text-decoration: none;
}
#crp_related img {
  max-width: 150px;
  margin: auto;
}
#crp_related .crp_title {
  position: absolute;
  height: inherit;
  bottom: 6px;
  left: 6px;
  padding: 3px;
  width: 144px;  /* = 150px - (3px * 2) */
  color: #fff;
  font-size: .9em;
  text-shadow: #000 .1em .1em .2em;
  background: rgb(0.5, 0.5, 0.5);
  background: rgba(0, 0, 0, 0.5);
}
#crp_related li:hover .crp_title {
  background: rgb(0.2, 0.2, 0.2);
  background: rgba(0, 0, 0, 0.8);
}

But the related post are in vertical. I’d like to see them in a horizontal row.
Where is my error ?

Thank you

http://wordpress.org/plugins/contextual-related-posts/