*{
    box-sizing: border-box;
}

.window {
    height: 40px;
    width: 80%;
    background-color: white;
    margin: 10%;
    position: absolute;
}

main{
    width: 50%;
    height: 500px;
    background-color: black;
    position:relative;
}

ol{
    position: absolute;
    background-color: black;
    height: 60%;
    width: 80%;
    margin: 25% 5%;
    display: flex;
    flex-flow: row wrap;
    align-items: center;
}

li{
  width: 25%;
  height: 50px;
  background-color: white;
  border-radius: 50%;
  text-align: center;
  list-style: none;
  font-weight: 900;
  font-size: 40px;
  color: blue;
}