Static Files

    Flask automatically adds a view that takes a path relative to the flaskr/static directory and serves it. The base.html template already has a link to the style.css file:

    Besides CSS, other types of static files might be files with JavaScript functions, or a logo image. They are all placed under the flaskr/static directory and referenced with url_for('static', filename='...').

    flaskr/static/style.css

    1. html { font-family: sans-serif; background: #eee; padding: 1rem; }
    2. body { max-width: 960px; margin: 0 auto; background: white; }
    3. h1 { font-family: serif; color: #377ba8; margin: 1rem 0; }
    5. hr { border: none; border-top: 1px solid lightgray; }
    6. nav { background: lightgray; display: flex; align-items: center; padding: 0 0.5rem; }
    7. nav h1 { flex: auto; margin: 0; }
    8. nav h1 a { text-decoration: none; padding: 0.25rem 0.5rem; }
    9. nav ul li a, nav ul li span, header .action { display: block; padding: 0.5rem; }
    10. .content { padding: 0 1rem 1rem; }
    11. .content > header { border-bottom: 1px solid lightgray; display: flex; align-items: flex-end; }
    12. .content > header h1 { flex: auto; margin: 1rem 0 0.25rem 0; }
    13. .flash { margin: 1em 0; padding: 1em; background: #cae6f6; border: 1px solid #377ba8; }
    15. .post > header > div:first-of-type { flex: auto; }
    16. .post > header h1 { font-size: 1.5em; margin-bottom: 0; }
    17. .post .body { white-space: pre-line; }
    18. .content:last-child { margin-bottom: 0; }
    19. .content form { margin: 1em 0; display: flex; flex-direction: column; }
    20. .content label { font-weight: bold; margin-bottom: 0.5em; }
    21. .content input, .content textarea { margin-bottom: 1em; }
    22. .content textarea { min-height: 12em; resize: vertical; }
    23. input.danger { color: #cc2f2e; }

    You can find a less compact version of style.css in the example code.

    You can read more about CSS from . If you change a static file, refresh the browser page. If the change doesn’t show up, try clearing your browser’s cache.