Learn Spanish (Spain): El color del salón es bonito. - The color of the living room is pretty.

In Spanish, when the preposition de (of) is immediately followed by the masculine singular word for the, which is el, they must combine into the contraction del. You will never write or say de el as separate words.

Why don't we say something like El salón's color?

Spanish never uses an apostrophe-s to show belonging. Instead, you have to flip the phrase around using de (of). So, the living room's color always becomes the color of the living room (el color del salón).

Does the word bonito (pretty) describe the color or the living room?

It describes el color (the color), which is the main subject of the sentence. Because color is a masculine word, the adjective takes the masculine form bonito. Even if the room were a feminine word like la cocina (the kitchen), the adjective would still be bonito because we are describing the color, not the room itself.

Why do we use es (is) here rather than está?

es comes from the verb ser, which we use to talk about physical descriptions and characteristics. The color of a room is considered a defining trait, so we use ser instead of estar (which is mainly for locations or temporary states).