node_modules/material-design-lite/src/tabs/_tabs.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-tabs {
  display: block;
  width: 100%;
}

.mdl-tabs__tab-bar {
    display         : flex;
    flex-direction  : row;
    justify-content : center; // ⇾
    align-content   : space-between; // ||
    align-items     : flex-start; // ↓

    height          : 48px;
    padding         : 0 0 0 0;
    margin          : 0;
    border-bottom   : 1px solid $tab-border-color;
}

.mdl-tabs__tab {
  margin: 0;
  border: none;
  padding: 0 24px 0 24px;

  float: left;
  position: relative;
  display: block;

  text-decoration: none;
  height: 48px;
  line-height: 48px;

  text-align: center;
  font-weight: 500;
  font-size: $layout-tab-font-size;
  text-transform: uppercase;

  color: $tab-text-color;
  overflow: hidden;

  .mdl-tabs.is-upgraded &.is-active {
    color: $tab-active-text-color;
  }

  .mdl-tabs.is-upgraded &.is-active:after {
    height: 2px;
    width: 100%;
    display: block;
    content: " ";
    bottom: 0px;
    left: 0px;
    position: absolute;
    background: $tab-highlight-color;
    animation: border-expand 0.2s cubic-bezier(0.4, 0.0, 0.4, 1) 0.01s alternate forwards;
    transition: all 1s cubic-bezier(0.4, 0.0, 1, 1);
  }

  & .mdl-tabs__ripple-container {
    display: block;
    position: absolute;
    height: 100%;
    width: 100%;
    left: 0px;
    top: 0px;
    z-index: 1;
    overflow: hidden;

    & .mdl-ripple {
      background: $tab-highlight-color;
    }
  }
}

.mdl-tabs__panel {
  display: block;

  .mdl-tabs.is-upgraded & {
    display: none;
  }

  .mdl-tabs.is-upgraded &.is-active {
    display: block;
  }
}

@keyframes border-expand {
  0% {
    opacity: 0;
    width: 0;
  }

  100% {
    opacity: 1;
    width: 100%;
  }
}