progress {
  /* Positioning */
  position: fixed;
  left: 0;
  top: 0;
  /* Dimensions */
  width: 100%;
  height: 0.25em;
  /* Reset the apperance */
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  /* Get rid of the default border in Firefox/Opera. */
  border: none;
  /* For Firefox/IE10+ */
  background-color: transparent;
  /* For IE10+, color of the progress bar */
  color: #171B22;
}

#progressBar.flat {
  display: none;
}

#progressBar.flat.progress-stick {
  display: inline;
}

#progressBar.flat.progress-stick {
  -webkit-animation: fadein 1s;
  display: inline;
  -moz-animation: fadein 1s;
  -ms-animation: fadein 1s;
  -o-animation: fadein 1s;
  animation: fadein 1s;
}

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

@-moz-keyframes fadein {
  from {
    opacity: 0;
  }
  
  to {
    opacity: 1;
  }
}

@-webkit-keyframes fadein {
  from {
    opacity: 0;
  }
  
  to {
    opacity: 1;
  }
}

@-ms-keyframes fadein {
  from {
    opacity: 0;
  }
  
  to {
    opacity: 1;
  }
}

@-o-keyframes fadein {
  from {
    opacity: 0;
  }
  
  to {
    opacity: 1;
  }
}

progress::-webkit-progress-bar {
  background-color: transparent;
}

.flat::-webkit-progress-value {
  background-color: #171B22;
}

.flat::-moz-progress-bar {
  background-color: #171B22;
}

.single::-webkit-progress-value {
  background-color: transparent;
  background-image: -webkit-linear-gradient(left, transparent, red);
}

.single::-moz-progress-bar {
  background-color: transparent;
  background-image: -moz-linear-gradient(left, transparent, red);
}

.multiple::-webkit-progress-value {
  background-image: -webkit-linear-gradient(-45deg, transparent 33%, rgba(0, 0, 0, 0.1) 33%, rgba(0, 0, 0, 0.1) 66%, transparent 66%), -webkit-linear-gradient(left, green, red);
}

.multiple::-moz-progress-bar {
  background-image: -moz-linear-gradient(-45deg, transparent 33%, rgba(0, 0, 0, 0.1) 33%, rgba(0, 0, 0, 0.1) 66%, transparent 66%), -moz-linear-gradient(left, green, red);
}

.progress-container {
  width: 100%;
  background-color: transparent;
  position: fixed;
  top: 0;
  left: 0;
  height: 0.25em;
  display: block;
}

.progress-bar {
  background-color: #171B22;
  width: 50%;
  display: block;
  height: inherit;
}