body {
  background-color: #6f9ceb;
  background-image: url("images/stars3.png");
  background-position:center;
  color: black;
  font-family: Verdana;
  display: flex;
  flex-wrap:wrap;
  align-items: center;
  justify-content: space-around;
  
}

#rect{
  width: 80%;
  height:700px;
}
.construct{
  display: inline-block;
  position: relative;
  background-image: url("../images/rectangle.png");
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.construct-content{
  color:white;
  position:absolute;
  left: 17%;
  top:13%;
  width: 78%;
  height:70%;
}

#back{
  background-color: #404b55;
  border: 5px solid white;
  border-radius: 25px;
  padding:10px;
  position: absolute;
  bottom:10px;
  left:10px;
  transition: 0.5s;
  color:white;
  text-decoration:none;
}

#back:hover{
  background-color: #606b75;
}