新建一个json文件，放到以下目录中
C:\Program Files\Epic Games\UE_5.3\Engine\Content\Slate\Themes\
然后在编辑器中就可以选择Light_1的主题了

{
	"Version": 1,
	"Id": "34BC967A4F09ED1F960CC3B6ACF1F467",
	"DisplayName": "Light_1",
	"Colors":
	{
		"EStyleColor::Black": "(R=0.489583,G=0.489583,B=0.489583,A=1.000000)",
		"EStyleColor::Background": "(R=0.244792,G=0.244792,B=0.244792,A=1.000000)",
		"EStyleColor::Title": "(R=0.380208,G=0.380208,B=0.380208,A=1.000000)",
		"EStyleColor::WindowBorder": "(R=0.000000,G=0.000000,B=0.000000,A=1.000000)",
		"EStyleColor::Foldout": "(R=0.442708,G=0.181282,B=0.150393,A=1.000000)",
		"EStyleColor::Input": "(R=0.400000,G=0.400000,B=0.400000,A=1.000000)",
		"EStyleColor::InputOutline": "(R=0.078125,G=0.078125,B=0.078125,A=1.000000)",
		"EStyleColor::Recessed": "(R=0.088542,G=0.088542,B=0.088542,A=1.000000)",
		"EStyleColor::Panel": "(R=0.192708,G=0.192708,B=0.192708,A=1.000000)",
		"EStyleColor::Header": "(R=0.400011,G=0.513419,B=0.526042,A=0.600000)",
		"EStyleColor::Dropdown": "(R=0.140625,G=0.140625,B=0.140625,A=1.000000)",
		"EStyleColor::DropdownOutline": "(R=0.838542,G=0.838542,B=0.838542,A=1.000000)",
		"EStyleColor::Hover": "(R=0.300000,G=0.160000,B=0.150000,A=1.000000)",
		"EStyleColor::Hover2": "(R=0.593750,G=0.243131,B=0.201704,A=1.000000)",
		"EStyleColor::White": "(R=1.000000,G=1.000000,B=1.000000,A=1.000000)",
		"EStyleColor::White25": "(R=0.500000,G=0.500000,B=0.500000,A=1.000000)",
		"EStyleColor::Highlight": "(R=0.000000,G=0.187821,B=0.679542,A=1.000000)",
		"EStyleColor::Primary": "(R=0.291667,G=0.166678,B=0.151910,A=1.000000)",
		"EStyleColor::PrimaryHover": "(R=0.281250,G=0.115167,B=0.095544,A=1.000000)",
		"EStyleColor::PrimaryPress": "(R=0.651042,G=0.266591,B=0.221166,A=1.000000)",
		"EStyleColor::Secondary": "(R=0.276042,G=0.220833,B=0.000000,A=0.600000)",
		"EStyleColor::Foreground": "(R=1.000000,G=1.000000,B=1.000000,A=1.000000)",
		"EStyleColor::ForegroundHover": "(R=0.911458,G=0.911458,B=0.911458,A=1.000000)",
		"EStyleColor::ForegroundInverted": "(R=0.000000,G=0.000000,B=0.000000,A=1.000000)",
		"EStyleColor::ForegroundHeader": "(R=1.000000,G=1.000000,B=1.000000,A=1.000000)",
		"EStyleColor::Select": "(R=0.009721,G=0.250158,B=0.502886,A=1.000000)",
		"EStyleColor::SelectInactive": "(R=0.318547,G=0.450786,B=0.520996,A=1.000000)",
		"EStyleColor::SelectParent": "(R=0.229167,G=0.229167,B=0.229167,A=1.000000)",
		"EStyleColor::SelectHover": "(R=0.500000,G=0.500000,B=0.500000,A=1.000000)",
		"EStyleColor::Notifications": "(R=0.009721,G=0.250158,B=0.502886,A=1.000000)",
		"EStyleColor::AccentBlue": "(R=0.019382,G=0.496933,B=1.000000,A=1.000000)",
		"EStyleColor::AccentPurple": "(R=0.356400,G=0.040915,B=0.520996,A=1.000000)",
		"EStyleColor::AccentPink": "(R=1.000000,G=0.168269,B=0.332452,A=1.000000)",
		"EStyleColor::AccentRed": "(R=1.000000,G=0.051269,B=0.051269,A=1.000000)",
		"EStyleColor::AccentOrange": "(R=0.991102,G=0.327778,B=0.002125,A=1.000000)",
		"EStyleColor::AccentYellow": "(R=0.520833,G=0.372757,B=0.005380,A=1.000000)",
		"EStyleColor::AccentGreen": "(R=0.416263,G=0.869792,B=0.110406,A=1.000000)",
		"EStyleColor::AccentBrown": "(R=0.215861,G=0.074214,B=0.040915,A=1.000000)",
		"EStyleColor::AccentBlack": "(R=0.062500,G=0.062500,B=0.062500,A=1.000000)",
		"EStyleColor::AccentGray": "(R=0.215861,G=0.215861,B=0.215861,A=1.000000)",
		"EStyleColor::AccentWhite": "(R=1.000000,G=1.000000,B=1.000000,A=1.000000)",
		"EStyleColor::AccentFolder": "(R=0.467784,G=0.274677,B=0.090842,A=1.000000)",
		"EStyleColor::Warning": "(R=1.000000,G=0.479320,B=0.000000,A=1.000000)",
		"EStyleColor::Error": "(R=0.863157,G=0.035601,B=0.035601,A=1.000000)",
		"EStyleColor::Success": "(R=0.015362,G=0.869792,B=0.078882,A=1.000000)",
		"EStyleColor::User1": "(R=0.004777,G=0.004777,B=0.004777,A=1.000000)",
		"EStyleColor::User2": "(R=0.000000,G=0.187821,B=0.679542,A=1.000000)",
		"EStyleColor::User3": "(R=1.000000,G=1.000000,B=1.000000,A=1.000000)",
		"EStyleColor::User4": "(R=0.258183,G=0.539479,B=0.068478,A=1.000000)",
		"EStyleColor::User5": "(R=1.000000,G=0.715693,B=0.010330,A=1.000000)",
		"EStyleColor::User6": "(R=1.000000,G=0.051269,B=0.051269,A=1.000000)",
		"EStyleColor::User7": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User8": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User9": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User10": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User11": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User12": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User13": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User14": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User15": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)",
		"EStyleColor::User16": "(R=0.000000,G=0.000000,B=0.000000,A=0.000000)"
	}
}