html

    <div class="container">
      <div class="progress-container">
        <div class="progress" id="progress"></div>
        <div class="circle active">1</div>
        <div class="circle">2</div>
        <div class="circle">3</div>
        <div class="circle">4</div>
      </div>

      <button class="btn" id="prev" disabled>이전</button>
      <button class="btn" id="next">다음</button>
    </div>

css

@import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

:root {
  --line-fill: #3498db;
  --line-empty: #e0e0e0;
}

* {
  box-sizing: border-box;
}

body {
  background-color: #f6f7fb;
  font-family: 'Muli', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.container {
  text-align: center;
}

.progress-container {
  display: flex;
  justify-content: space-between;
  position: relative;
  margin-bottom: 30px;
  min-width: 350px;
}

/* emty 바와 컬러 바 일단 주석처리

.progress-container::before {
  content: '';
  background-color: var(--line-empty);
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 100%;
  z-index: -1;
}
.progress {
  background-color: var(--line-fill);
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 0%;
  z-index: -1;
  transition: 0.4s ease;
}
*/

.circle {
  background-color: #fff;
  color: #999;
  border-radius: 50%;
  height: 30px;
  width: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--line-empty);
  transition: 0.4s ease;
}

.circle.active {
  border-color: var(--line-fill);
}

.btn {
  background-color: var(--line-fill);
  color: #fff;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  padding: 8px 30px;
  margin: 5px;
  font-size: 14px;
}

.btn:active {
  transform: scale(0.98);
}

.btn:focus {
  outline: 0;
}

.btn:disabled {
  background-color: var(--line-empty);
  cursor: not-allowed;
}