body {
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
}

.header {
  text-align: center;
}
.header .container {
  display: flex;
  justify-content: space-between;
  position: relative;
  margin-bottom: 30px;
  max-width: 100%;
  width: 350px;
}
.header .container::before {
  content: "";
  background-color: #e0e0e0;
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 100%;
  z-index: -1;
}
.header .progress {
  background-color: #3498db;
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 0%;
  z-index: -1;
  transition: 0.4s ease;
}
.header .cercle {
  background-color: white;
  color: rgba(153, 153, 153, 0.6);
  border-radius: 50%;
  height: 30px;
  width: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid #e0e0e0;
  transition: 0.4s ease;
}
.header .cercle.active {
  border-color: #3498db;
}
.header .btn {
  background-color: #3498db;
  color: #fff;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  padding: 8px 30px;
  margin: 5px;
  font-size: 14px;
}
.header .btn:active {
  transform: scale(0.95);
}
.header .btn:disabled {
  background-color: rgba(153, 153, 153, 0.6);
}

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