Add a slight Inner Glow to the rectangle, using white at 5px in size to give a very slight bevelled edge effect.

再次为这个圆角矩形兄添加一个内发光，白色的5像素即可，这样会让边线产生一个很细小的倾斜效果。

youdao

Use the Inner Glow option in a similar manner to add a thin white stroke effect to the inside of the sidebar.

再用内发光工具给侧边栏添加一个白色的边线效果，方法跟上面的一样。

youdao

Use the Outer glow option to add a very slight grey border, adjusting the Spread to the Max will turn the default glow into a solid strip of colour which helps add this double stroke effect.

继续用外发光来添加一个浅灰色的边，调整扩展值到最大这样我们可以得到一个双边线效果。

youdao

But he is credited with developing a way to use it that minimised some objects appearing to have a strange looking glow as a side-effect.

BBC: Blue and green-screen effects pioneer Petro Vlahos dies