beige
Describes a light, yellowish-gray or sand-colored shade.
Für das Wohnzimmer haben wir eine beige Wandfarbe gewählt, weil sie so neutral ist.
For the living room, we chose a beige wall color because it is so neutral.

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Describes a light, yellowish-gray or sand-colored shade.
Für das Wohnzimmer haben wir eine beige Wandfarbe gewählt, weil sie so neutral ist.
For the living room, we chose a beige wall color because it is so neutral.

The adjective 'beige' is invariable (indeclinable). That means it does not get an ending when it comes before a noun. This is a special feature that also applies to other color adjectives such as 'lila' (purple) or 'rosa' (pink).
Er trägt einen beigen Pullover.
He is wearing a beige sweater.
'Beige' is a loanword from French. This explains the spelling and pronunciation, which are unusual for German, as well as the invariable form.
Die neuen Sofas sind alle beige.
The new sofas are all beige.
As a neutral color, 'beige' is very commonly used in the areas of fashion, furniture, and interior design. It is often associated with elegance and restraint.
Ein beiger Trenchcoat ist ein echter Klassiker.
A beige trench coat is a true classic.
brown
'braun' and 'beige' both describe colors that can be close to each other. 'braun' is usually darker and suggests earth, wood, or chocolate. 'beige' is lighter, sand-colored, and often somewhat yellowish or gray. They can be confused when a shade lies between light brown and beige. As a practical rule: if the color is clearly dark and warm, you are more likely to say 'braun'. If it is light and calm like sand or light-colored clothing, 'beige' fits better.

Im Schaufenster hängt heute ein beiger Mantel neben den schwarzen Jacken.
Today there is a beige coat hanging in the shop window next to the black jackets.
Mein Bruder hat einen braunen Rucksack für die Wanderung gekauft.
My brother bought a brown backpack for the hike.