getMargin method
It'll provide CSS margin code.
Implementation
String getMargin() {
if (all != null) {
return "margin:${getSizeWithUnit(all, sizeUnit)};";
} else if (zeroAuto != null) {
return "margin:$zeroAuto;";
} else {
return """margin:${getSizeWithUnit(top, sizeUnit)} ${getSizeWithUnit(right, sizeUnit)} ${getSizeWithUnit(bottom, sizeUnit)} ${getSizeWithUnit(left, sizeUnit)};""";
}
}