Mixin Parameters in SASS

An important feature of mixins in SASS is that they accept variables as parameters, which are written inside parentheses and, if there are several variables, they are separated by commas.

Let's consider the following example:

@mixin active($color, $width) {
	border: {
		color: $color;
		width: $width;
		style: dotted;
	}
}
p {
	@include active(yellow, 2px);
}

Compilation result:

p {
	border-color: yellow;
	border-width: 2px;
	border-style: dashed; 
}

In addition, you can pass default parameter values to mixins:

@mixin active($color,  $width: 2px) {
	border: {
		color: $color;
		width: $width;
		style: dotted;
	}
}
p {
	@include active(yellow);
}
div {
	@include active(yellow, 4px);
}

After compilation we will see:

p {
	border-color: yellow;
	border-width: 2px;
	border-style: dotted;
}
div {
	border-color: yellow;
	border-width: 4px;
	border-style: dotted;
}

Tell me what the result of compiling the following code will be:

@mixin simple-border($padding-top, $padding-bottom) {
	border: {
		padding-top: $padding-top;
		padding-bottom: $padding-bottom;
		color: green;
	}
}
p {
	@include simple-border(10px, 30px );
}

Tell me what the result of compiling the following code will be:

@mixin simple-border($padding-top, $padding-bottom: 20px) {
	border: {
	padding-top: $padding-top;
	padding-bottom: $padding-bottom;
	color: green;
	}
}
p {
	@include simple-border(10px);
}