.myBtn1 {
  position: absolute;
  left: 750px;
  top: 445px;
  width: 81px;
  height: 81px;
  background: url(../css/img/dmlrus/btn1.png);
  cursor: pointer;
}
.myBtn2 {
  position: absolute;
  left: 838px;
  top: 445px;
  width: 81px;
  height: 81px;
  background: url(../css/img/dmlrus/btn2.png);
  cursor: pointer;
}

.myBtn1:hover {
  background: url(../css/img/dmlrus/btn1_over.png);
}
.myBtn2:hover {
  background: url(../css/img/dmlrus/btn2_over.png);
}

.myThinkBox {
  position: absolute;
  left: 510px;
  top: 268px;
  width: 405px;
  height: 157px;
  line-height: 20px;
  background: transparent;
  border: 0;
}