rich mans border
HTML
<canvas id="canvas"></canvas>
JavaScript
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
function richMansBorder(x,y,w,h,lw,bc,bgc) {
ctx.fillStyle=bc; //border color
ctx.fillRect(x,y,w,h);
ctx.fillStyle=bgc; //background color
ctx.fillRect(x+lw,y+lw,w-lw*2,h-lw*2);
}
richMansBorder(50,50,100,50,1,"black","white");