.banner {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 20px;
  width: 90%;
}
.center {
  margin: auto;
  padding: 10px;
}
.logo {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50px;
  height 50px;
}
#one, #two, #three { width: 33.3%; }
#one, #two { float: left; }
#three { float: right; clear: none; }