html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  width: 100%;
}
#wrapper {
  height: auto;
  margin-top: 145px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  text-align: left;
  width: 997px;
  background-color: #fff;
}
#div_top {
  position: absolute;
  top: 0;
  width: 100%;
  text-align: center;
}
#div_center_left {
  float: left;
  width: 642px;
}
#div_center_right {
  float: right;
  width: 320px;
}
#div_bottom {
  width: 100%;
  text-align: center;
}