diff --git a/src/SVGRenderer.hpp b/src/SVGRenderer.hpp
index 45af4dd..a7a564f 100644
--- a/src/SVGRenderer.hpp
+++ b/src/SVGRenderer.hpp
@@ -2,14 +2,20 @@
 
 #include <sstream>
 #include <fstream>
+#include <math.h>
 
 #include "Renderer.hpp"
 
 namespace massivedynamic {
 
 	class SVGRenderer : public Renderer {
+		private:
+			constexpr static float BORDER_WIDTH = 0.1f;
 		public:
-			SVGRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : Renderer(pixels, sourceSize, targetSize) {}
+			SVGRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : Renderer(pixels, sourceSize, targetSize) {
+				if (this->targetSize == 0)
+					this->targetSize = sourceSize * (2 * SVGRenderer::BORDER_WIDTH);
+			}
 			virtual void render(const std::string& filename) override {
 				std::stringstream file;
 
@@ -20,15 +26,15 @@ namespace massivedynamic {
 				file << base;
 				file << "viewBox=\"0 0 " << this->targetSize << " " << this->targetSize << "\"  xml:space=\"preserve\">" << '\n';
 				file << "    <rect x=\"0\" y=\"0\" width=\"" << this->targetSize << "\" height=\"" << this->targetSize << "\" style=\"fill: white;\" />" << '\n';
-				size_t pixelSize = this->targetSize / (this->sourceSize + 2);	
+				float pixelSize = static_cast<float>(this->targetSize) / static_cast<float>(this->sourceSize + 2);
 
 				for (size_t y = 0; y < this->sourceSize; y++) {
 					for (size_t x = 0; x < this->sourceSize; x++) {
 						if (!this->pixels.at(y * this->sourceSize + x))
 							continue;
-						size_t rectX = x * pixelSize + pixelSize;
-						size_t rectY = y * pixelSize + pixelSize;
-						file << "    <rect x=\"" << rectX << "\" y=\"" << rectY << "\" width=\"" << pixelSize << "\" height=\"" << pixelSize << "\" style=\"fill: black; stroke: black; stroke-width: 3;\" />" << '\n';
+						float rectX = x * pixelSize + pixelSize;
+						float rectY = y * pixelSize + pixelSize;
+						file << "    <rect x=\"" << rectX << "\" y=\"" << rectY << "\" width=\"" << pixelSize << "\" height=\"" << pixelSize << "\" style=\"fill: black; stroke: black; stroke-width: " << SVGRenderer::BORDER_WIDTH << "%;\" />" << '\n';
 					}
 				}