Add stamp border pattern

client/patterns/stamp-border/Cover.tsx

@@ -0,0 +1,48 @@
+/**
+ * A collection of popular layouts and patterns made with CSS (https://csslayout.io)
+ * (c) 2019 - 2020 Nguyen Huu Phuoc <https://twitter.com/nghuuphuoc>
+ */
+
+import React from 'react';
+
+import Frame from '../../placeholders/Frame';
+
+const Cover: React.FC<{}> = () => {
+    return (
+        <Frame>
+            <div
+                style={{
+                    alignItems: 'center',
+                    display: 'flex',
+                    flexDirection: 'column',
+                    height: '100%',
+                    justifyContent: 'center',
+                    padding: '8px',
+                }}
+            >
+                <div
+                    style={{
+                        backgroundColor: '#ccc',
+                        backgroundImage: 'radial-gradient(#fff 50%, transparent 50%)',
+                        backgroundPosition: '-5px -5px',
+                        backgroundRepeat: 'repeat',
+                        backgroundSize: '10px 10px',
+                        height: '100%',
+                        padding: '5px',
+                        width: '100%',
+                    }}
+                >
+                    <div
+                        style={{
+                            backgroundColor: '#ccc',
+                            height: '100%',
+                            width: '100%',
+                        }}
+                    />
+                </div>
+            </div>
+        </Frame>
+    );
+};
+
+export default Cover;