矢印をcssで作る時、回転させるtransform rotate をいつも忘れるのでメモ

くの字の矢印を作る際に、
transform: rotate(-135deg); の書き方をいつも忘れて、なんて書いて回転させるんだっけ？ってググってるのでメモ。

See the Pen 矢印ボタンのcss by takapen (@takapen) on CodePen.

/* 右のボタン */
.button-next {
  width: 32px;
  height: 32px;
  margin: auto;
  background: #fff;
  border-radius: 50%;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 10px;
  box-shadow: 0 0 2px rgba(0,0,0,0.4);
}
.button-next::before {
  content: "";
  width: 2px;
  height: 11px;
  background: #888;
  position: absolute;
  top: 14px;
  left: 16px;
  transform: rotate(-135deg);
}
.button-next::after {
  content: "";
  width: 2px;
  height: 11px;
  background: #888;
  position: absolute;
  top: 7px;
  left: 16px;
  transform: rotate(-45deg);
}


/* 左のボタン */
.button-prev {
  width: 32px;
  height: 32px;
  margin: auto;
  background: #fff;
  border-radius: 50%;
  position: absolute;
  top :0;
  bottom:0;
  left: 10px;
  box-shadow: 0 0 2px rgba(0,0,0,0.4);
}
.button-prev::before {
  content: "";
  width: 2px;
  height: 11px;
  background: #888;
  position: absolute;
  top: 14px;
  left: 13px;
  transform: rotate(-45deg);
}
.button-prev::after {
  content: "";
  width: 2px;
  height: 11px;
  background: #888;
  position: absolute;
  top: 7px;
  left: 13px;
  transform: rotate(-135deg);
}