Azad Rasul




6- Static files in Flask

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Azad Rasul
·Jan 5, 2023·

3 min read

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Table of contents

  • Create new folders:
  • Create Python, HTML, and CSS files
  • Create css style file:
  • Load background image

Static files are necessary files to render the complete web page such as images, JavaScript, or CSS.

Create new folders:

First, create a directory called static in your project directory using cmd:

mkdir C:\Users\gardi\flask-tutorial\static

Inside static folder create a "style" folder for styling the page and "img" folder for images using cmd:

mkdir C:\Users\gardi\flask-tutorial\static\style
mkdir C:\Users\gardi\flask-tutorial\static\img

Create Python, HTML, and CSS files

Create a Python file to render index template and save it as "":

from flask import Flask, render_template
app = Flask(__name__)

def index():
   return render_template("index.html")

if name == '__main__': = True)

Then create index.html

<!doctype html>
<html lang="en">
    <meta charset="utf-8">
    <title>CS304: Flask</title>
    <link rel="stylesheet" type="text/css" 
          href="{{ url_for('static', filename='style.css') }}">

    <h1>Using Static File</h1>


This sentence code defines the link of the style file:

    <link rel="stylesheet" type="text/css" 
          href="{{ url_for('static', filename='style.css') }}">

Create css style file:

Create a css file inside "static\style" folder for styling your pages and save it as "style.css":

html { font-family: sans-serif; background: #eee; padding: 1rem; }
body { max-width: 960px; margin: 0 auto; background: white; }
h1 { font-family: serif; color: #377ba8; margin: 1rem 0; }
a { color: #377ba8; }
hr { border: none; border-top: 1px solid lightgray; }
nav { background: lightgray; display: flex; align-items: center; padding: 0 0.5rem; }
nav h1 { flex: auto; margin: 0; }
nav h1 a { text-decoration: none; padding: 0.25rem 0.5rem; }
nav ul  { display: flex; list-style: none; margin: 0; padding: 0; }
nav ul li a, nav ul li span, header .action { display: block; padding: 0.5rem; }
.content { padding: 0 1rem 1rem; }
.content > header { border-bottom: 1px solid lightgray; display: flex; align-items: flex-end; }
.content > header h1 { flex: auto; margin: 1rem 0 0.25rem 0; }
.flash { margin: 1em 0; padding: 1em; background: #cae6f6; border: 1px solid #377ba8; }
.post > header { display: flex; align-items: flex-end; font-size: 0.85em; }
.post > header > div:first-of-type { flex: auto; }
.post > header h1 { font-size: 1.5em; margin-bottom: 0; }
.post .about { color: slategray; font-style: italic; }
.post .body { white-space: pre-line; }
.content:last-child { margin-bottom: 0; }
.content form { margin: 1em 0; display: flex; flex-direction: column; }
.content label { font-weight: bold; margin-bottom: 0.5em; }
.content input, .content textarea { margin-bottom: 1em; }
.content textarea { min-height: 12em; resize: vertical; }
input.danger { color: #cc2f2e; }
input[type=submit] { align-self: start; min-width: 10em; }

Run the "" script inside cmd:


Now open your internet browser and write:


Your styled web page should be opened like this:

Load background image

Inside img directory, put an image and name it "background.jpg".

To insert the background image add the following code to the index template:

<img src= "{{ url_for("static", filename= "img/background.jpg") }}">

The index file is now should be looks like this:

<html lang="en">


    <meta charset="utf-8">

    <title>CS304: Flask</title>

    <link rel="stylesheet" type="text/css"

          href="{{ url_for('static', filename='style.css') }}">



<img src= "{{ url_for("static", filename= "img/background.jpg") }}">



Now reload opened web page to inset the background image looks like that:

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