.uif-layout
  display flex
  flex-direction column
  flex auto
  &-has-sider
    flex-direction row

.uif-layout-header
.uif-layout-footer
  height 64px
  flex 0 0 auto

.uif-layout-content
  flex auto

.uif-layout-sider
  transition all .2s ease-in-out
  position relative
  &-children
    height 100%