add do.sh and basic css chang

do.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# Do - The Simplest Build Tool on Earth.
+# Documentation and examples see https://github.com/8gears/do
+
+set -Eeuo pipefail # -e "Automatic exit from bash shell script on error"  -u "Treat unset variables and parameters as errors"
+
+run() {
+  echo "I am ${FUNCNAME[0]}ning"
+  npx webpack serve
+}
+
+
+"$@" # <- execute the task
+
+[ "$#" -gt 0 ] || printf "Usage:\n\t./do.sh %s\n" "($(compgen -A function | grep '^[^_]' | paste -sd '|' -))"

src/App.css

@@ -4,8 +4,8 @@
 }
 
 .mainContent{
-  display: flex;
-  justify-content: center;
+  width: 80%;
+  margin: auto;
 }
 
 body {