Working in the Internet is the most boring. It is very monotonous to face the computer all day long. It will be more annoying when you are under great pressure.
If you want to give him a gift at this time, then I recommend you to give him something fun. After all, you will forget the pressure when you play. If he works in the Internet, then you can give him a sun jar. Just buy the kind without patterns, but you can draw patterns on it. Then you can draw patterns on it yourself, such as funny expressions, or if you are a couple, you can draw your photos on it. In this way, when he sees the jar while working, he will smile foolishly and naturally relax a little. Although it is a bit difficult to draw your own photos, just try your best. Even if the drawing is not good, at least the effect can be achieved.
Let me introduce you to several kinds of table decorations, such as stealing money cats, funny dolls, etc., which are all very good, or you can give him a small green potted plant. Green plants can always make people relax.
If you want to relieve stress, gifts are only part of it. Finding time to go out for a walk together is the most useful way.