# Background ## Background type ### Background Color: The background-color property sets the background color of an element. It can be specified using a color name (e.g. "red"), a hexadecimal value (e.g. "#ff0000"), or an RGB value (e.g. "RGB(255, 0, 0)") or RGBA (e.g. "RGBA(255,0,0,0.5)") ### Background Image(bglmg): The background-image property sets an image as the background of an element. The URL of the image can be specified in the value of the property. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.acho.io/app-builder/app-construction/elements/css-styles/background.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.