.mainbox2 {
  display:flex;
  position: absolute; 
  align-items:center;
  flex-direction:column;
  justify-content:center;
  text-align:center;
  height:1080px;
  width:800px;
  background:rgba(255, 255, 255, 0.7);
  margin:0;
  padding-bottom:25px;
  border-radius:10px;
}