Generated by SassMeister.com.

input.scss

#onboarding {
  .not-allowed, .not-allowed * {
    cursor: not-allowed !important;
  }

  .not-allowed span a {
    pointer-events: none !important;
  }

  section:not(:target):not(#onboarding) {
    cursor: not-allowed !important;
  }

  section:not(:target):not(#onboarding) > * {
    pointer-events: none !important;
  }

  .steps-form {
    width: 2px;
    height: 65%;
    position: fixed;
    top: 12%;
    left: 3%;
    display: none;
  }

  .steps-form .steps-row {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
  }

  .steps-form .steps-row:before {
    top: -4px;
    bottom: 0;
    position: absolute;
    content: "";
    width: 2px;
    height: 112%;
    background-color: #a77272;
  }

  .steps-form .steps-row .steps-step {
    height: 115px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    text-align: center;
    position: relative;
  }

  .steps-form .steps-row .steps-step.no-height {
    height: 50px;
  }

  .steps-form .steps-row .steps-step p {
    margin-top: 0.5rem;
  }

  .steps-form .steps-row .steps-step button[disabled] {
    opacity: 1 !important;
    filter: alpha(opacity=100) !important;
  }

  .steps-form .steps-row .steps-step .btn-circle {
    width: 5px;
    height: 5px;
    border: 2px solid #8d5959;
    background-color: white !important;
    position: relative;
    color: #8d5959 !important;
    border-radius: 50%;
    padding: 9px 9px 7.5px 7.5px;
    margin-top: -22px;
  }

  .btn-circle {
    background-image: linear-gradient(to bottom, #de3127 50%, transparent 50%);
    background-size: 100% 200%;
    background-position: bottom;
    transition: background-position 0.5s ease-in-out; /** I've changed the time for demo purposes **/
  }

  .steps-form .steps-row .half-completed .btn-circle {
    background-position: center;
  }

  .steps-form .steps-row .completed .btn-circle {
    background-position: top;
    border: 2px solid #de3127;
    color: #de3127 !important;
  }

  .steps-form .steps-row .completed .btn-circle svg {
    position: absolute;
    color: white;
    width: 15px;
    height: 15px;
    left: 1px;
    top: 1px;
  }

  .steps-form .steps-row .steps-step .btn-circle span {
    font-size: 1.3rem;
    position: absolute;
    margin-top: -0.7rem;
    margin-left: -0.2rem;
  }
}

output.css

#onboarding .not-allowed, #onboarding .not-allowed * {
  cursor: not-allowed !important;
}
#onboarding .not-allowed span a {
  pointer-events: none !important;
}
#onboarding section:not(:target):not(#onboarding) {
  cursor: not-allowed !important;
}
#onboarding section:not(:target):not(#onboarding) > * {
  pointer-events: none !important;
}
#onboarding .steps-form {
  width: 2px;
  height: 65%;
  position: fixed;
  top: 12%;
  left: 3%;
  display: none;
}
#onboarding .steps-form .steps-row {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
}
#onboarding .steps-form .steps-row:before {
  top: -4px;
  bottom: 0;
  position: absolute;
  content: "";
  width: 2px;
  height: 112%;
  background-color: #a77272;
}
#onboarding .steps-form .steps-row .steps-step {
  height: 115px;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  text-align: center;
  position: relative;
}
#onboarding .steps-form .steps-row .steps-step.no-height {
  height: 50px;
}
#onboarding .steps-form .steps-row .steps-step p {
  margin-top: 0.5rem;
}
#onboarding .steps-form .steps-row .steps-step button[disabled] {
  opacity: 1 !important;
  filter: alpha(opacity=100) !important;
}
#onboarding .steps-form .steps-row .steps-step .btn-circle {
  width: 5px;
  height: 5px;
  border: 2px solid #8d5959;
  background-color: white !important;
  position: relative;
  color: #8d5959 !important;
  border-radius: 50%;
  padding: 9px 9px 7.5px 7.5px;
  margin-top: -22px;
}
#onboarding .btn-circle {
  background-image: linear-gradient(to bottom, #de3127 50%, transparent 50%);
  background-size: 100% 200%;
  background-position: bottom;
  transition: background-position 0.5s ease-in-out;
  /** I've changed the time for demo purposes **/
}
#onboarding .steps-form .steps-row .half-completed .btn-circle {
  background-position: center;
}
#onboarding .steps-form .steps-row .completed .btn-circle {
  background-position: top;
  border: 2px solid #de3127;
  color: #de3127 !important;
}
#onboarding .steps-form .steps-row .completed .btn-circle svg {
  position: absolute;
  color: white;
  width: 15px;
  height: 15px;
  left: 1px;
  top: 1px;
}
#onboarding .steps-form .steps-row .steps-step .btn-circle span {
  font-size: 1.3rem;
  position: absolute;
  margin-top: -0.7rem;
  margin-left: -0.2rem;
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.26.11",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}