#desc_img {
    float: left;
    width: 75px;
    margin: 0 20px 0 0px;
}

.announcement {
  float: left; 
  width: 715px;
  background-color: lemonchiffon;
  padding: 10px 20px;
  margin-bottom: 20px;
  border: 1px solid #AAA;
  line-height: 1.5;
}

.right_is_right {
  display: block;
  float: right;
  margin: -25px 0 0 0;
}