Loading-bar animation

---

- 애니메이션 효과는 title과 gauge 두개의 요소에 적용시켰다.

- gauge는 bar요소내부에 width:0으로 적용, keyframes에서 width:100% 늘어나는 구조가 기본 뼈대

- keyframes 중간값을 설정해 background-color가 계속 바뀌게 설정

 

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Mulish", sans-serif;
}

.loading {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 216px;
  width: 500px;
}

.loading-title {
  margin-bottom: 20px;
  text-align: center;
  font-size: 30px;
  font-weight: 400;
  line-height: 1.333333333333333;
  color: #151b26;
  animation-name: flicker;
  animation-duration: 1600ms;
  animation-iteration-count: infinite;
  animation-direction: alternate;
}

.progress-bar {
  position: relative;
  height: 15px;
  width: 500px;
  border-radius: 100px;
  background-color: #e5eaef;
  overflow: hidden;
}

.progress-bar-gauge {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 15px;
  border-radius: 100px;
  background-color: #13ce66;
  animation-name: loading-bar;
  animation-duration: 5000ms;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
}

@keyframes flicker {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes loading-bar {
  0% {
    width: 0;
    opacity: 1;
  }
  50% {
    opacity: 1;
    background-color: #0093e9;
  }
  85% {
    opacity: 1;
    background-color: #ff9a8b;
  }
  to {
    width: 100%;
    opacity: 0;
    background-color: #ff9a8b;
  }
}

---