background.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
div {
  min-height: 100vh;
  text-transform: uppercase;
  color: red;
  font-size: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.big-img {
  background: url(./images/iki.jpg);
  background-repeat: repeat-x;
  background-repeat: round;
}
.small-img {
  background: url(./images/uc.jpg);
  /*
  background-repeat: repeat-y;
  background-repeat: space;
  background-size: contain;
  */
  background-repeat: no-repeat;
  background-position: center;
  background-position: 20% 20%;
}
.folder-img {
  background: url(./images/bir.jpeg);
  background-size: cover;
}

.Attacment-img1 {
  background: url(./images/dort.jpg);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
.Attacment-img2 {
  background: url(./images/bir.jpeg);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
.Attacment-img3 {
  background: url(./images/dort.jpg);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}