diff --git a/packages/pintora-core/src/index.ts b/packages/pintora-core/src/index.ts
index c8ce862e..56de5265 100644
--- a/packages/pintora-core/src/index.ts
+++ b/packages/pintora-core/src/index.ts
@@ -5,8 +5,10 @@ import { logger, setLogLevel } from './logger'
 import configApi from './config'
 
 export * from './util'
-import { encodeForUrl, decodeCodeInUrl, makeMark, calculateTextDimensions } from './util'
+import { encodeForUrl, decodeCodeInUrl, makeMark, calculateTextDimensions, parseColor } from './util'
 import { symbolRegistry, SymbolDef, SymbolStyleAttrs } from './symbol-registry'
+import { StyleParam, interpreteStyles } from './style-engine'
+import * as styleEngine from './style-engine'
 
 export {
   logger,
@@ -15,6 +17,8 @@ export {
   symbolRegistry,
   SymbolDef,
   SymbolStyleAttrs,
+  StyleParam,
+  interpreteStyles,
 }
 
 type DrawOptions = {
@@ -24,6 +28,8 @@ type DrawOptions = {
 const pintora = {
   configApi,
   diagramRegistry,
+  symbolRegistry,
+  styleEngine,
   parseAndDraw(text: string, opts: DrawOptions) {
     const { onError } = opts
     const diagram = diagramRegistry.detectDiagram(text)
@@ -48,8 +54,8 @@ const pintora = {
     decodeCodeInUrl,
     makeMark,
     calculateTextDimensions,
+    parseColor,
   },
-  symbolRegistry,
 }
 
 export default pintora
diff --git a/packages/pintora-core/src/style-engine.ts b/packages/pintora-core/src/style-engine.ts
new file mode 100644
index 00000000..c3bd02c6
--- /dev/null
+++ b/packages/pintora-core/src/style-engine.ts
@@ -0,0 +1,62 @@
+/**
+ * This module evaluate custom style params to real style configs
+ */
+import { parseColor } from './util/color'
+
+export type StyleValueType = 'color' | 'fontSize'
+
+export type StyleMeta = {
+  valueType: StyleValueType | StyleValueType[]
+}
+
+export type StyleParam<K = string> = {
+  key: K
+  value: string
+}
+
+type StyleEvaluateResult<T> = { valid: true; value: T } | { valid: false }
+
+interface StyleValueTypeMap {
+  color: string
+  fontSize: number
+}
+
+const styleValueEvaluators: { [K in StyleValueType]: (p: StyleParam) => StyleEvaluateResult<StyleValueTypeMap[K]> } = {
+  color({ value }) {
+    const parsed = parseColor(value)
+    return { value: parsed.color, valid: true }
+  },
+  fontSize({ value }) {
+    const parsed = parseInt(value)
+    if (isNaN(parsed)) return { valid: false }
+    return { value: parsed, valid: true }
+  },
+}
+
+type StyleRuleMap = Record<string, StyleMeta>
+
+/**
+ * Generate style config from style params
+ */ 
+export function interpreteStyles<T extends StyleRuleMap>(
+  ruleMap: T,
+  params: StyleParam[],
+): { [K in keyof T]: T[K]['valueType'] } {
+  const out: any = {}
+  params.forEach(param => {
+    const meta = ruleMap[param.key]
+    if (!meta) return
+    const valueTypes = Array.isArray(meta.valueType) ? meta.valueType : [meta.valueType]
+    for (const valueType of valueTypes) {
+      const evaluator = styleValueEvaluators[valueType]
+      if (!evaluator) continue
+      const result = evaluator(param)
+      if (result.valid) {
+        out[param.key] = result.value
+        return
+      }
+    }
+  })
+  // console.log('interpreteStyles', out)
+  return out
+}
diff --git a/packages/pintora-diagrams/src/util/color.ts b/packages/pintora-core/src/util/color.ts
similarity index 100%
rename from packages/pintora-diagrams/src/util/color.ts
rename to packages/pintora-core/src/util/color.ts
diff --git a/packages/pintora-core/src/util/index.ts b/packages/pintora-core/src/util/index.ts
index 607b541f..858b1576 100644
--- a/packages/pintora-core/src/util/index.ts
+++ b/packages/pintora-core/src/util/index.ts
@@ -4,3 +4,4 @@ export * from './geometry'
 export { IFont, calculateTextDimensions } from './text-metric'
 export { encodeForUrl, decodeCodeInUrl } from './encode'
 export { makeMark } from './mark'
+export { parseColor } from './color'
diff --git a/packages/pintora-diagrams/src/sequence/__tests__/sequence-parser.spec.js b/packages/pintora-diagrams/src/sequence/__tests__/sequence-parser.spec.js
index 4b191a4e..ef7b53a7 100644
--- a/packages/pintora-diagrams/src/sequence/__tests__/sequence-parser.spec.js
+++ b/packages/pintora-diagrams/src/sequence/__tests__/sequence-parser.spec.js
@@ -431,4 +431,25 @@ sequenceDiagram
       },
     ])
   })
+
+  it('can parse style clause', () => {
+    const example = stripStartEmptyLines(`
+sequenceDiagram
+  @style noteTextColor #00bbaa
+  @style messageFontSize 20
+  `)
+    parse(example)
+    const ir = db.getDiagramIR()
+    // console.log(JSON.stringify(ir, null, 2))
+    expect(ir.styleParams).toMatchObject([
+      {
+        key: 'noteTextColor',
+        value: '#00bbaa',
+      },
+      {
+        key: 'messageFontSize',
+        value: '20',
+      },
+    ])
+  })
 })
diff --git a/packages/pintora-diagrams/src/sequence/artist.ts b/packages/pintora-diagrams/src/sequence/artist.ts
index c811016f..d6bd658d 100644
--- a/packages/pintora-diagrams/src/sequence/artist.ts
+++ b/packages/pintora-diagrams/src/sequence/artist.ts
@@ -16,7 +16,7 @@ import {
   makeid,
   configApi,
 } from '@pintora/core'
-import { db, SequenceDiagramIR, LINETYPE, Message, PLACEMENT, WrappedText, GroupAttrs } from './db'
+import { db, SequenceDiagramIR, LINETYPE, Message, PLACEMENT, WrappedText } from './db'
 import { SequenceConf, getConf } from './config'
 import { getBaseNote, drawArrowTo, drawCrossTo, getBaseText, makeMark, makeLoopLabelBox } from './artist-util'
 import { ITheme } from '../util/themes/base'
@@ -49,8 +49,8 @@ const GROUP_LABEL_MAP = {
 
 const sequenceArtist: IDiagramArtist<SequenceDiagramIR> = {
   draw(ir, config?) {
-    console.log('[draw]', ir)
-    conf = getConf()
+    // console.log('[draw]', ir)
+    conf = getConf(ir.styleParams)
     theme = (configApi.getConfig() as DiagramsConf).themeConfig.themeVariables
     model.init()
     logger.debug(`C:${JSON.stringify(conf, null, 2)}`)
@@ -71,7 +71,7 @@ const sequenceArtist: IDiagramArtist<SequenceDiagramIR> = {
     calcLoopMinWidths(ir.messages)
     const maxMessageWidthPerActor = getMaxMessageWidthPerActor(ir)
     model.maxMessageWidthPerActor = maxMessageWidthPerActor
-    conf.actorHeight = calculateActorMargins(actors, maxMessageWidthPerActor)
+    model.actorHeight = calculateActorMargins(actors, maxMessageWidthPerActor)
 
     drawActors(rootMark, ir, { verticalPos: 0 })
     const loopWidths = calculateLoopBounds(messages)
@@ -295,6 +295,8 @@ class Model {
   /** backgrounds for groups like loop and opt */
   groupBgs: Rect[]
 
+  actorHeight: number
+
   private onBoundsFinishCbs: Array<OnBoundsFinishCallback>
 
   init() {
@@ -312,6 +314,7 @@ class Model {
     this.loopMinWidths = {}
     this.onBoundsFinishCbs = []
     this.groupBgs = []
+    this.actorHeight = conf.actorHeight
   }
   clear() {
     this.activations = []
@@ -903,7 +906,7 @@ export const drawActors = function (
     // Add some rendering data to the object
     safeAssign(attrs, {
       width: attrs.width || conf.actorWidth,
-      height: Math.max(attrs.height || 0, conf.actorHeight),
+      height: Math.max(attrs.height || 0, model.actorHeight),
       margin: attrs.margin || conf.actorMargin,
       x: prevWidth + prevMargin,
       y: verticalPos,
@@ -971,7 +974,7 @@ export const drawActors = function (
   }
 
   // Add a margin between the actor boxes and the first arrow
-  model.bumpVerticalPos(conf.actorHeight)
+  model.bumpVerticalPos(model.actorHeight)
 }
 
 function drawActivationTo(mark: Group, data: ActivationData) {
diff --git a/packages/pintora-diagrams/src/sequence/config.ts b/packages/pintora-diagrams/src/sequence/config.ts
index 3c75d2a7..fa38fe6c 100644
--- a/packages/pintora-diagrams/src/sequence/config.ts
+++ b/packages/pintora-diagrams/src/sequence/config.ts
@@ -2,6 +2,7 @@ import { MarkAttrs } from '@pintora/core'
 import { PALETTE } from '../util/theme'
 import { configApi, safeAssign } from '@pintora/core'
 import { DiagramsConf } from '../type'
+import { interpreteStyles, StyleParam } from '../util/style'
 
 export type SequenceConf = {
   noteWidth: number
@@ -84,13 +85,16 @@ export const defaultConfig: SequenceConf = {
   showSequenceNumbers: false,
 }
 
-export const conf: SequenceConf = {
-  ...defaultConfig,
-}
+export const SEQUENCE_STYLE_RULES = {
+  noteTextColor: { valueType: 'color' },
+  messageTextColor: { valueType: 'color' },
+  messageFontSize: { valueType: 'fontSize' },
+} as const
 
-export function getConf() {
+export function getConf(styleParams: StyleParam[]) {
   const globalConfig: DiagramsConf = configApi.getConfig()
   const t = globalConfig.themeConfig.themeVariables
+  const conf = {...defaultConfig}
   safeAssign(conf, {
     actorBackground: t.primaryColor,
     actorBorderColor: t.primaryBorderColor,
@@ -103,5 +107,6 @@ export function getConf() {
     dividerTextColor: t.secondaryTextColor,
   })
   Object.assign(conf, globalConfig.sequence || {})
+  Object.assign(conf, interpreteStyles(SEQUENCE_STYLE_RULES, styleParams))
   return conf
 }
diff --git a/packages/pintora-diagrams/src/sequence/db.ts b/packages/pintora-diagrams/src/sequence/db.ts
index 7ad22d34..abfe256c 100644
--- a/packages/pintora-diagrams/src/sequence/db.ts
+++ b/packages/pintora-diagrams/src/sequence/db.ts
@@ -1,5 +1,5 @@
-import { Group, logger, OrNull } from '@pintora/core'
-import { parseColor } from '../util/color'
+import { logger, OrNull, parseColor } from '@pintora/core'
+import { StyleParam } from '../util/style'
 
 export interface WrappedText {
   text: string
@@ -91,6 +91,7 @@ export type SequenceDiagramIR = {
   title: string
   showSequenceNumbers: boolean
   // titleWrapped: boolean
+  styleParams: StyleParam[]
 }
 
 class SequenceDB {
@@ -102,6 +103,7 @@ class SequenceDB {
   titleWrapped: boolean = false
   wrapEnabled = false
   showSequenceNumbers = false
+  styleParams: SequenceDiagramIR['styleParams'] = []
 
   addActor(id: string, name: string, description: ParsedDescription) {
     // Don't allow description nulling
@@ -237,6 +239,10 @@ class SequenceDB {
     return message
   }
 
+  addStyle(sp: StyleParam) {
+    this.styleParams.push(sp)
+  }
+
   getActor(id: string) {
     return this.actors[id]
   }
@@ -252,6 +258,7 @@ class SequenceDB {
     this.actors = {}
     this.title = ''
     this.showSequenceNumbers = false
+    this.styleParams = []
   }
 
   getDiagramIR(): SequenceDiagramIR {
@@ -261,6 +268,7 @@ class SequenceDB {
       actors: this.actors,
       title: this.title,
       showSequenceNumbers: this.showSequenceNumbers,
+      styleParams: this.styleParams,
     }
   }
 
@@ -306,6 +314,9 @@ class SequenceDB {
         case 'addDivider':
           db.addSignalWithoutActor({ text: param.text, wrap: false }, param.signalType)
           break
+        case 'addStyle':
+          db.addStyle({ key: param.key, value: param.value })
+          break
       }
     }
   }
@@ -339,6 +350,9 @@ export function enableSequenceNumbers() {
   db.showSequenceNumbers = true;
 }
 
+/**
+ * action param that will be handled by `apply`
+ */
 type ApplyParam =
   | {
       type: 'addActor'
@@ -382,6 +396,11 @@ type ApplyParam =
       signalType: LINETYPE
       text: string
     }
+  | {
+      type: 'addStyle'
+      key: string
+      value: string
+    }
 
 export {
   db
diff --git a/packages/pintora-diagrams/src/sequence/parser/sequenceDiagram.ne b/packages/pintora-diagrams/src/sequence/parser/sequenceDiagram.ne
index 9c423e7d..fb29044c 100644
--- a/packages/pintora-diagrams/src/sequence/parser/sequenceDiagram.ne
+++ b/packages/pintora-diagrams/src/sequence/parser/sequenceDiagram.ne
@@ -1,6 +1,6 @@
 @{%
 import * as moo from 'moo'
-import { tv, textToCaseInsensitiveRegex, VALID_TEXT_REGEXP } from '../../util/parser-shared'
+import { tv, textToCaseInsensitiveRegex, VALID_TEXT_REGEXP, COLOR_REGEXP } from '../../util/parser-shared'
 
 let lexer = moo.states({
   main: {
@@ -44,6 +44,7 @@ export function setYY(v) {
 @lexer lexer
 @builtin "string.ne"
 @builtin "whitespace.ne"
+@include "../../util/parser-grammars/style.ne"
 
 start -> __ start {% (d) => d[1] %}
 	| "sequenceDiagram" document __:? {%
@@ -148,6 +149,7 @@ statement ->
         return { type: 'addDivider', text, signalType: yy.LINETYPE.DIVIDER }
       }
     %}
+  | styleClause _ %NEWLINE
 
 words -> (%WORD | %SPACE):+ {%
       function(d) {
@@ -271,5 +273,3 @@ par_sections ->
       ])
     }
   %}
-
-color -> %COLOR {% (d) => tv(d[0]) %}
diff --git a/packages/pintora-diagrams/src/util/parser-grammars/style.ne b/packages/pintora-diagrams/src/util/parser-grammars/style.ne
new file mode 100644
index 00000000..790f712f
--- /dev/null
+++ b/packages/pintora-diagrams/src/util/parser-grammars/style.ne
@@ -0,0 +1,19 @@
+@{%
+export const COLOR = /#[a-zA-Z0-9]+/
+export const STYLE = /@style/
+%}
+
+color -> %COLOR {% (d) => tv(d[0]) %}
+
+styleClause ->
+    %STYLE __ [a-zA-Z0-9]:+ __ [^ \n]:+ {%
+      function(d) {
+        // console.log('[styleClause]', d[2], JSON.stringify(d[4]))
+        const key = d[2].map(v => tv(v)).join('')
+        let value = d[4]
+        if (typeof value !== 'string') value = value.map(v => tv(v)).join('')
+        // console.log('[styleClause] result', key, value)
+        return { type: 'addStyle', key, value }
+      }
+    %}
+
diff --git a/packages/pintora-diagrams/src/util/parser-shared.ts b/packages/pintora-diagrams/src/util/parser-shared.ts
index 6c073387..f79c37d0 100644
--- a/packages/pintora-diagrams/src/util/parser-shared.ts
+++ b/packages/pintora-diagrams/src/util/parser-shared.ts
@@ -16,8 +16,12 @@ export function textToCaseInsensitiveRegex(text) {
 
 /** token value */
 export function tv(token) {
-  return token.value
+  if (token && ('value' in token)) return token.value
+  return token
 }
 
 /** CJK friendly text pattern */
 export const VALID_TEXT_REGEXP = /(?:[a-zA-Z0-9_]\p{Unified_Ideograph})+/
+
+/** hex color */
+export const COLOR_REGEXP = /#[a-zA-Z0-9]+/
diff --git a/packages/pintora-diagrams/src/util/style.ts b/packages/pintora-diagrams/src/util/style.ts
new file mode 100644
index 00000000..fea978dd
--- /dev/null
+++ b/packages/pintora-diagrams/src/util/style.ts
@@ -0,0 +1,6 @@
+import { StyleParam, interpreteStyles } from '@pintora/core'
+
+export {
+  StyleParam,
+  interpreteStyles,
+}