node_modules/material-design-lite/src/progress/_progress.scss

/**
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

@import "../variables";

.mdl-progress {
  display: block;
  position: relative;
  height: $bar-height;
  width: 500px;
  max-width: 100%;
}

.mdl-progress > .bar {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  width: 0%;
  transition: width 0.2s $animation-curve-default;
}

.mdl-progress > .progressbar {
  background-color: $progress-main-color;
  z-index: 1;
  left: 0;
}

.mdl-progress > .bufferbar {
  background-image: linear-gradient(to right, $progress-secondary-color, $progress-secondary-color),
    linear-gradient(to right, $progress-main-color, $progress-main-color);
  z-index: 0;
  left: 0;
}

.mdl-progress > .auxbar {
  right: 0;
}

// Webkit only
@supports (-webkit-appearance:none) {
  .mdl-progress:not(.mdl-progress--indeterminate):not(.mdl-progress--indeterminate) > .auxbar,
  .mdl-progress:not(.mdl-progress__indeterminate):not(.mdl-progress__indeterminate) > .auxbar {
    background-image: linear-gradient(to right, $progress-secondary-color, $progress-secondary-color),
      linear-gradient(to right, $progress-main-color, $progress-main-color);
    mask: url('#{$progress-image-path}/buffer.svg?embed');
  }
}

.mdl-progress:not(.mdl-progress--indeterminate) > .auxbar,
.mdl-progress:not(.mdl-progress__indeterminate) > .auxbar {
  background-image: linear-gradient(to right, $progress-fallback-buffer-color, $progress-fallback-buffer-color),
    linear-gradient(to right, $progress-main-color, $progress-main-color);
}

.mdl-progress.mdl-progress--indeterminate > .bar1,
.mdl-progress.mdl-progress__indeterminate > .bar1 {
  background-color: $progress-main-color;
  animation-name: indeterminate1;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

.mdl-progress.mdl-progress--indeterminate > .bar3,
.mdl-progress.mdl-progress__indeterminate > .bar3 {
  background-image: none;
  background-color: $progress-main-color;
  animation-name: indeterminate2;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

@keyframes indeterminate1 {
  0% {
    left: 0%;
    width: 0%;
  }
  50% {
    left: 25%;
    width: 75%;
  }
  75% {
    left: 100%;
    width: 0%;
  }
}

@keyframes indeterminate2 {
  0% {
    left: 0%;
    width: 0%;
  }
  50% {
    left: 0%;
    width: 0%;
  }
  75% {
    left: 0%;
    width: 25%;
  }
  100% {
    left: 100%;
    width: 0%;
  }
}