*,
*:before,
*:after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-size: 100%;
}

body {
  padding: 0;
  height: 100vh;
}

ul {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  list-style-type: none;
  text-align: center;
  font-family: 'Noto Sans KR', sans-serif;
  font-weight: 700;
}

span {
  display: inline;
}

span:nth-child(1) {
  color: black;
}

span:nth-child(2) {
  color: green;
}

span:nth-child(3) {
  color: orange;
}

span:nth-child(4) {
  color: blue;
}

span:nth-child(5) {
  color: gray;
}

span:nth-child(5):after {
  content: ".";
}

button {
  position: absolute;
  top: 70%;
  left: 50%;
  transform: translateX(-50%);
  padding: 20px;
  color: white;
  background-color: red;
  font-weight: 600;
  border-radius: 10%;
}