components/Timeline/style/rtl.less
.@{timeline-prefix-cls}-rtl {
  .@{timeline-item-prefix-cls}-vertical-left {
    > .@{timeline-item-prefix-cls}-content-wrapper {
      text-align: left;
    }
  }

  &.@{timeline-prefix-cls}-alternate {
    .@{timeline-prefix-cls}-item-vertical-left.@{timeline-prefix-cls}-item-label-relative {
      > .@{timeline-prefix-cls}-item-label {
        left: 50%;
        text-align: left;
        padding-left: @timeline-vertical-margin-content-left;
        padding-right: 0;
      }

      > .@{timeline-prefix-cls}-item-content-wrapper {
        text-align: right;
        right: 50%;
        left: initial;
        margin-right: @timeline-vertical-margin-content-left;
        padding-left: @timeline-vertical-margin-content-left;
        padding-right: 0;
        margin-left: 0;
      }
    }

    .@{timeline-prefix-cls}-item-vertical-right.@{timeline-prefix-cls}-item-label-relative {
      > .@{timeline-prefix-cls}-item-label {
        right: 50%;
        text-align: right;
        padding-right: @timeline-vertical-margin-content-left;
        padding-left: 0;
      }

      > .@{timeline-prefix-cls}-item-content-wrapper {
        text-align: left;
        left: 0;
        right: initial;
        margin-right: -(@timeline-vertical-margin-content-left + @timeline-dot-size-width);
        padding-left: @timeline-vertical-margin-content-left+ @timeline-dot-size-width;
        margin-left: 0;
        padding-right: 0;
      }
    }

    .@{timeline-item-prefix-cls}-vertical-left {
      > .@{timeline-prefix-cls}-item-content-wrapper {
        right: 50%;
        text-align: right;
      }
    }

    .@{timeline-item-prefix-cls}-vertical-right {
      > .@{timeline-prefix-cls}-item-content-wrapper {
        left: 0;
        margin-right: -(@timeline-vertical-margin-content-left + @timeline-dot-size-width);
        padding-left: @timeline-vertical-margin-content-left+ @timeline-dot-size-width;
        margin-left: 0;
        padding-right: 0;
        text-align: left;
      }
    }
  }
}
