message: fix: change transition-duration to make animate smoothly
diff: border-top: 1px solid #f0f0f0;
  box-shadow: 0 -6px 16px -8px rgba(0, 0, 0, 0.08), 0 -9px 28px 0 rgba(0, 0, 0, 0.05),
  0 -12px 48px 16px rgba(0, 0, 0, 0.03);
  - transition: width 0.4s;
  + transition: width 0.2s;
  &__left {
  flex: 1 1;
  