bg {
-ms-writing-mode: tb-rl;
writing-mode: vertical-rl;
span {
-webkit-text-combine: horizontal;
-ms-text-combine-horizontal: all;
text-combine-upright: all;
}
}
//縦書き解除
writing-mode: horizontal-tb;
<p class="bg"> 臨川閣<span>4</span>階</p>