This code includes two SCSS functions, hsba and hsb, used to convert HSB (Hue, Saturation, Brightness) color values to HSLA (Hue, Saturation, Lightness, Alpha) color values. Below is a brief introduction to each function:

Calculates $x and $l, which represent intermediate variables and lightness, respectively. Based on different $x values, it calculates saturation $saturation and then returns the corresponding hsla value.

Calls the hsba function with the alpha set to 1.

These functions are mainly used to convert HSB colors to HSLA colors supported by CSS, making them convenient for use in styles.