@import url('https://fonts.googleapis.com/css2?family=Montserrat&display=swap');

:root {
  --line-border-fill: #3498db;
  --line-border-empty: #aaa6a6;
  --backround-color: #f6f6f6;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--backround-color);
  font-family: 'Montserrat', open-sans;
  height: 100vh;
  overflow: hidden;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center; /*cross axis here column so horizontal*/
  justify-content: center; /*main axis here column so vertical*/
}

.container {
  text-align: center;
}

.progress-container {
  display: flex;
  justify-content: space-between;
  max-width: 100%;
  width: 350px;
  position: relative;
  margin-bottom: 30px;
  /* border: 1px solid black; */
}

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

.progress {
  background-color: var(--line-border-fill);
  position: absolute;
  width: 0%;
  height: 4px;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: -1;
  transition: 0.4s ease;
}

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

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

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

.btn:active {
  transform: scale(0.95);
}

.btn:focus {
  outline: 0;
}

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