app/dist/tabs/index.wxss

.i-tabs {
  display: flex;
  width: 100%;
  height: 42px;
  line-height: 42px;
  box-sizing: border-box;
  position: relative;
  justify-content: space-between;
  align-items: center;
  -webkit-box-align: center;
  background: #f8f8f8;
}

.i-tabs::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 200%;
  height: 200%;
  transform: scale(.5);
  transform-origin: 0 0;
  pointer-events: none;
  box-sizing: border-box;
  border: 0 solid #e9eaec;
  border-bottom-width: 1px
}

.i-tabs-scroll {
  display: block;
  overflow-x: auto;
  white-space: nowrap
}

.i-tabs-fixed {
  position: fixed;
  top: 0;
  z-index: 2
}