diff --git a/01_Day_Introduction/01_day_starter/helloworld.js b/01_Day_Introduction/01_day_starter/helloworld.js
index 8c9e2c0..060caa5 100644
--- a/01_Day_Introduction/01_day_starter/helloworld.js
+++ b/01_Day_Introduction/01_day_starter/helloworld.js
@@ -1 +1,7 @@
-console.log('Hello, World!')
\ No newline at end of file
+
+//To output in the console:
+console.log('Hello, World!');
+
+
+//to write into the document/page
+document.write("Hello World!");
\ No newline at end of file
diff --git a/01_Day_Introduction/01_day_starter/variable.js b/01_Day_Introduction/01_day_starter/variable.js
index 62558cb..f71da39 100644
--- a/01_Day_Introduction/01_day_starter/variable.js
+++ b/01_Day_Introduction/01_day_starter/variable.js
@@ -8,6 +8,10 @@ let age = 100 // age in years
let isMarried = true
// Declaring variables with number values
+// We can use keywords like var,let and const to declare variables
+// let allows one time declaration and multiple time value assignment
+// const allows one time declarartion as well as assignment
+// var allows multiple declaration and assignment
const gravity = 9.81 // earth gravity in m/s2
const boilingPoint = 100 // water boiling point, temperature in oC
@@ -18,3 +22,4 @@ const PI = 3.14 // geometrical constant
let name = 'Asabeneh', //name of a person
job = 'teacher',
live = 'Finland'
+
diff --git a/index.html b/index.html
index 14e41c3..ab4b8e2 100644
--- a/index.html
+++ b/index.html
@@ -3,8 +3,10 @@
Document Object Model:30 Days Of JavaScript
+
+
diff --git a/main.css b/main.css
new file mode 100644
index 0000000..da8491f
--- /dev/null
+++ b/main.css
@@ -0,0 +1,9 @@
+
+body{
+ background-color: black;
+
+}
+div.wrapper h1{
+ color : #ffff;
+
+}