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Put the PNG on the element with CSS—not directly in the HTML—using background-image. Set the element’s size, then choose background-repeat, background-position, and background-size for the result you want.
Minimal working example
HTML provides the box that will display the image. CSS assigns the PNG to that box:
<section class="hero">
<h1>Page title</h1>
</section>.hero {
min-height: 320px;
background-image: url("images/background.png");
background-repeat: no-repeat;
background-position: center;
background-size: cover;
background-color: #f3f4f6;
}background-image points to the PNG file. The path is resolved from the CSS file when the rule is in an external stylesheet, so spelling, capitalization and directory levels must all match the real file.
What each background property does
background-image: assign the PNG
Use url("...") with a relative or absolute URL that the browser can request. For an external stylesheet at css/site.css, url("images/background.png") means css/images/background.png, not a folder beside your HTML file. Adjust the path accordingly.
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background-repeat: stop or control tiling
Browsers repeat a background image by default. A hero or logo normally needs one image, so use background-repeat: no-repeat. Patterns can intentionally use repeat, repeat-x, or repeat-y; set a deliberate size so the tiles are not unexpectedly large or tiny.
background-size: fill the box or preserve every pixel
cover: scales the PNG until the entire element is covered while preserving its aspect ratio. Parts of the image can be cropped.contain: scales the complete PNG to fit inside the element. Empty space can remain on two sides.- Explicit lengths or percentages: values such as
240px 160pxor100% autogive predictable dimensions but require more responsive planning.
background-position: choose the visible focal point
center centers the image in both directions. The default is the top-left corner. Use combinations such as center top, right center, or percentages such as 70% 40% when cover would otherwise crop an important subject.
background-color: provide a fallback and contrast
The color appears while the image loads, if loading fails, and through transparent pixels in a PNG. Choose a color that contrasts with the image and with the text placed over it.
The element must have a painted area
A background cannot be visible outside the element’s box. Content, padding, a fixed height, or min-height creates that area. An empty div with no height has nothing to show even when its URL is correct.
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Choose settings for the job
| Use case | Recommended settings | Trade-off |
|---|---|---|
| Full-bleed hero or banner | no-repeat center / cover |
Fills the box responsively, but may crop the edges. |
| Logo or icon panel | no-repeat center / contain |
Shows every pixel, with possible empty space. |
| Repeating texture or pattern | repeat (or a directional repeat) plus an explicit size |
Creates a tile; scale and seams must be checked. |
| Fixed-size artwork | Explicit background-size lengths |
Predictable dimensions, less fluid on different screens. |
Common implementation variants
Use the long form while developing
Separate declarations make overridden or missing values easy to find:
.card {
min-height: 240px;
background-color: #f3f4f6;
background-image: url("../images/card.png");
background-repeat: no-repeat;
background-position: center top;
background-size: contain;
}Use the shorthand after the values are correct
The shorthand combines color, image, position, size and repeat. A slash separates position from size:
.hero {
background: #f3f4f6 url("images/background.png") center / cover no-repeat;
}Apply a one-off background inline
<section
class="hero"
style="background-image: url('images/background.png');"
>
<h1>Page title</h1>
</section>Inline CSS is useful for a data-driven URL, but a stylesheet is easier to maintain and override.
Make a viewport-height hero
.hero {
min-height: 100vh;
padding: 4rem 1.5rem;
display: grid;
align-content: center;
background: #111 url("images/background.png") center / cover no-repeat;
}Use padding as well as a minimum height so the text remains readable when it wraps on a narrow screen.
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Keep the subject visible
With cover, the crop changes as the element’s aspect ratio changes. Move the focal point with background-position, or switch to contain when cropping is unacceptable. If neither is suitable, use an explicit size and let the surrounding color show.
Make transparent PNG pixels intentional
A transparent PNG reveals the element’s background color or whatever is behind it. Set background-color explicitly rather than assuming a white page, especially for icons and dark artwork.
Add a readable overlay
CSS supports multiple backgrounds. Put a gradient before the PNG so it is painted on top:
.hero {
min-height: 320px;
background:
linear-gradient(90deg, rgba(0, 0, 0, .65), rgba(0, 0, 0, 0)),
url("images/background.png") center / cover no-repeat;
}The first layer is closest to the viewer. Keep text contrast in mind at every responsive crop.
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Background image or <img>?
Use a CSS background for decorative artwork, a hero treatment behind content, or an image that should not appear as a separate item in the document. Use an <img> when the image is content that needs alternative text, should participate in image search, or must preserve its intrinsic dimensions. A background image has no alt attribute; meaningful information should not be communicated only through it.
Why the PNG background is not showing
1. The URL is wrong
Open developer tools, inspect the element, and look at the Network panel. A 404 usually means the path, filename, extension, or case is wrong. Recalculate a relative URL from the location of the CSS file, not from the HTML file.
2. The element has no height
Inspect the element’s box model. Add content, padding, height, or min-height. A background on a zero-height element is technically present but invisible.
3. Another rule overrides it
In the Styles pane, find the crossed-out declaration and the selector that wins. Check component styles, media queries and shorthand declarations such as background: white, which can reset an earlier image.
4. The PNG is transparent
Temporarily apply a contrasting background-color. If the artwork appears, the file loaded correctly and its transparent pixels simply match the page.
5. It repeats unexpectedly
Add background-repeat: no-repeat. If you are building a pattern, define background-size so the tile scale is intentional.
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6. The subject is cropped
Change cover to contain, move background-position, or use an explicit size. Cropping is expected behavior for cover, not a failed load.
7. The image is blocked or stale
Check the Network response status and the browser console for mixed-content or permission errors. Hard-refresh after replacing a file, and verify that the server returns the PNG at the exact URL shown in the request.
Performance and reliability considerations
- Use an image dimension appropriate for the largest box you actually display; an unnecessarily large PNG takes longer to transfer and decode.
- Reserve space with
min-heightor padding to reduce layout changes while the image loads. - Keep a solid fallback color so a slow or failed request still leaves a usable design.
- Test narrow, wide and unusually tall viewports.
covercan expose different crops at each ratio. - Check keyboard focus and text contrast when content is placed over the image; the background itself cannot provide alternative text.
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import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://screenshotneo.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js:
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const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);You can also wait for a selector, a delay or network idle; load lazy images; set a viewport or one of 12 device presets; use retina scale; hide selectors; inject custom CSS or JavaScript; click an element; set cookies, headers, a user agent, timezone or geolocation; block ads, trackers, requests or resource types; capture one CSS-selected element; create PDFs; resize images; cache with a chosen TTL; generate signed image links; submit asynchronous jobs with signed webhooks; capture up to 100 URLs per bulk call; and query usage. Existing parameter names used by other screenshot APIs also work.
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FAQ
Can I use a PNG stored on another domain?
Yes, if the URL is publicly reachable and the server permits the browser’s request. For a local file, use a local development server rather than relying on a file:// URL.
How do I layer two PNG backgrounds?
Separate layers with commas, placing the first layer closest to the viewer: background-image: url("foreground.png"), url("background.png");. Give each layer its own position and size when their layouts differ.
Can I change the background for dark mode?
Yes. Put a second declaration in a @media (prefers-color-scheme: dark) block or apply a class to the element. Define the fallback color in the same dark-mode rule.
Why does a background look blurry on high-density screens?
The source PNG may not contain enough pixels for the displayed box, especially when it is enlarged by cover. Use an appropriately sized source and test on the target viewport sizes.
Frequently Asked Questions
Can I use a PNG stored on another domain?
Yes, when the URL is publicly reachable and the server permits the request. A local development server is safer than opening the page with a file:// URL.
How do I layer two PNG backgrounds?
Separate image layers with commas in background-image; the first layer is closest to the viewer. Set individual positions and sizes when needed.
Can I change the background for dark mode?
Use a prefers-color-scheme media query or a dark-mode class, and define a matching fallback background color.
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The source may be too small for the displayed box and is being enlarged. Use a source with enough pixels for the largest target viewport.
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