feat: add mobile css

src/elements/blank.ts

@@ -1,10 +1,17 @@
 import { AbstractElement } from './abstract-element';
 import jsPDF from 'jspdf';
 import { Box } from './box';
+import { IContext } from './context';
 
 export class Blank extends Box {
-  constructor(x: number, y: number, w: number, h: number) {
-    super(x, y, w, h);
+  constructor(
+    x: number,
+    y: number,
+    w: number,
+    h: number,
+    context: Partial<IContext> = AbstractElement.DEFAULT_CONTEXT
+  ) {
+    super(x, y, w, h, context);
   }
 
   public static heightBlank(h: number) {