aliapp-demo/page/component/component-pages/view/view.acss

.red {
  background: red;
}
.stream {
  display: flex;
  flex-direction: column;
  padding: 10rpx;
}
.post + .post {
  margin-top: 10rpx;
}
.post {
  display: flex;
}
.postUser {
  flex: 0 1 auto;
  padding-bottom: 20rpx;
}
.postUser__name {
  width: 180rpx;
  color: #57727C;
  font-size: 24rpx;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  margin-top: 60rpx;
}
.postBody {
  flex: 1 1 0%;
  position: relative;
  padding: 30rpx;
  border: 2rpx solid #CAD0D2;
  border-radius: 8rpx;
}
.postBody:after,
.postBody:before {
  right: 100%;
  top: 70rpx;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
}
.postBody:after {
  border-color: transparent;
  border-right-color: #ffffff;
  border-width: 16rpx;
  margin-top: -16rpx;
}
.postBody:before {
  border-color: transparent;
  border-right-color: #CAD0D2;
  border-width: 18rpx;
  margin-top: -18rpx;
}
.postBody__content {
  color: #57727C;
  font-size: 24rpx;
}
.postBody__date {
  margin-top: 10rpx;
  color: #86969C;
  font-size: 20rpx;
  text-transform: uppercase;
  letter-spacing: 2rpx;
}

.red {
  color: red;
}