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HTML

              
                <canvas id="canvas"></canvas>
              
            
!

CSS

              
                #canvas {
  position: fixed;
}
              
            
!

JS

              
                
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");

canvas.width = canvas.height = 600;

// The context is in its default state so 
// no transforms and fill style is black

// First saved state
context.save();

// The context is now sitting at 150,150 with a fill style of red
context.translate(150, 150);
context.fillStyle = "red";

// Second saved state
context.save();

// Context is currently positioned at 150,150
// translating it 200,0 will move it to 350,150
context.translate(200, 0);
context.fillStyle = "blue";

// Let's add a shadow
context.shadowColor = "rgba(0,0,0,0.5)";
context.shadowOffsetX = 5;
context.shadowOffsetY = 5;
context.shadowBlur = 10;

context.fillRect(0, 0, 100, 100);

// Restore context back to previous saved state
context.restore();

// Context is back at 150,150 with a fill style of red
context.fillRect(0, 0, 100, 100);

// Restore context back to its default state
context.restore();

// Context is at 0,0 with a fill style of black
context.fillRect(0, 0, 100, 100);
              
            
!
999px

Console