diff --git a/packages/client/src/themes/l-simkey.json5 b/packages/client/src/themes/l-simkey.json5
new file mode 100644
index 000000000..9853b7f03
--- /dev/null
+++ b/packages/client/src/themes/l-simkey.json5
@@ -0,0 +1,53 @@
+{
+	id: '80b5d38c-c281-403b-9fc5-3bb4f1dc19b8',
+
+	name: 'simkey Vivid Light',
+	author: 'sim1222',
+
+	base: 'light',
+
+	props: {
+		bg: '#fafafa',
+		fg: '#444',
+		cwBg: '#b1b9c1',
+		cwFg: '#fff',
+		link: '#ff9400',
+		panel: '#fff',
+		accent: '#81c08b',
+		header: ':alpha<0.7<@panel',
+		infoBg: '#e5f5ff',
+		infoFg: '#72818a',
+		renote: '@accent',
+		shadow: 'rgba(0, 0, 0, 0.1)',
+		divider: 'rgba(0, 0, 0, 0.08)',
+		hashtag: '#92d400',
+		mention: '@accent',
+		modalBg: 'rgba(0, 0, 0, 0.3)',
+		buttonBg: 'rgba(0, 0, 0, 0.05)',
+		cwHoverBg: '#bbc4ce',
+		mentionMe: '@mention',
+		infoWarnBg: '#fff0db',
+		infoWarnFg: '#8f6e31',
+		navHoverFg: ':darken<17<@fg',
+		inputBorder: 'rgba(0, 0, 0, 0.1)',
+		inputBorderHover: 'rgba(0, 0, 0, 0.2)',
+		buttonHoverBg: 'rgba(0, 0, 0, 0.1)',
+		fgHighlighted: ':darken<3<@fg',
+		fgTransparent: ':alpha<0.5<@fg',
+		panelHighlight: ':darken<3<@panel',
+		listItemHoverBg: 'rgba(0, 0, 0, 0.03)',
+		scrollbarHandle: 'rgba(0, 0, 0, 0.2)',
+		wallpaperOverlay: 'rgba(255, 255, 255, 0.5)',
+		fgTransparentWeak: ':alpha<0.75<@fg',
+		panelHeaderDivider: '@divider',
+		scrollbarHandleHover: 'rgba(0, 0, 0, 0.4)',
+		X3: 'rgba(0, 0, 0, 0.05)',
+		X4: 'rgba(0, 0, 0, 0.1)',
+		X5: 'rgba(0, 0, 0, 0.05)',
+		X6: 'rgba(0, 0, 0, 0.25)',
+		X7: 'rgba(0, 0, 0, 0.05)',
+		X11: 'rgba(0, 0, 0, 0.1)',
+		X12: 'rgba(0, 0, 0, 0.1)',
+		X13: 'rgba(0, 0, 0, 0.15)',
+	},
+}