The Complete CSS Shadow Interactive Tutorial

Table of Contents

What are CSS shadows and which one to use

CSS gives you three main ways to create shadows:

box-shadow for shadows around boxes (divs, buttons, cards, inputs).
text-shadow for shadows behind text glyphs (letters).
filter: drop-shadow() for shadows that follow the actual visible pixels of an element (especially useful for transparent PNGs and SVGs).

A quick rule of thumb:

If you’re shadowing a card / panel / button → use box-shadow.
If you’re shadowing text → use text-shadow.
If you need a shadow that hugs a cut-out image (transparent background) → use filter: drop-shadow().

The shadow mental model: offset, blur, spread, color

Most shadow work is just playing with four “knobs”:

X offset: move the shadow left/right (negative goes left).
Y offset: move the shadow up/down (negative goes up).
Blur: how soft the shadow edges are (bigger = softer).
Spread (box-shadow only): grow or shrink the shadow before blur.

Then you choose a color (often a semi-transparent black like rgba(0, 0, 0, 0.25)).

CSS box-shadow basics

The classic syntax:

box-shadow: x y blur spread color;

You can also add inset to put the shadow inside the box.

Your first box-shadows

Click the snippets to see how each value changes the feel.

.card {
  box-shadow: 0px 0px 0px 0px rgba(0, 0, 0, 0.25);
}

.card {
  box-shadow: 0px 12px 24px 0px rgba(0, 0, 0, 0.18);
}

.card {
  box-shadow: 0px 24px 60px 0px rgba(0, 0, 0, 0.22);
}

.card {
  box-shadow: -18px 18px 40px 0px rgba(0, 0, 0, 0.18);
}

*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 260px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #f6f7fb;
}

.card {
width: 320px;
border-radius: 18px;
border: 2px solid #111;
background: #fff;
padding: 18px;
}

.card h4 {
margin: 0 0 8px 0;
font-size: 18px;
}

.card p {
margin: 0;
line-height: 1.4;
opacity: 0.85;
}




  
    Shadow card
    box-shadow is for boxes. Simple, powerful, and slightly addictive.

box-shadow interactive sliders

This playground lets you drag the four numeric values. Notice how:

Bigger Y makes it feel more “lifted”.
More blur makes it softer.
Spread can make the shadow feel “wider” without moving it.

X offset Y offset Blur radius Spread radius



.card {
box-shadow: 0px 18px 36px 0px rgba(0, 0, 0, 0.22);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 280px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #f6f7fb;
}

.card {
width: 340px;
border-radius: 18px;
border: 2px solid #111;
background: #fff;
padding: 18px;
}

.card .row {
display: flex;
gap: 10px;
margin-top: 12px;
}

.badge {
border: 2px solid #111;
border-radius: 999px;
padding: 6px 10px;
font-size: 13px;
background: #fff;
}




  
    Drag the sliders
    
      offset
      blur
      spread

Inset shadows (inside the box)

Add inset to push the shadow inside. This is great for:

pressed buttons
input fields
“carved” or “sunken” UI

.panel {
  box-shadow: inset 0px 0px 0px 0px rgba(0, 0, 0, 0.22);
}

.panel {
  box-shadow: inset 0px 10px 18px -12px rgba(0, 0, 0, 0.45);
}

.panel {
  box-shadow: inset 0px 0px 0px 2px rgba(0, 0, 0, 0.6);
}

.panel {
  box-shadow:
    inset 0px 12px 18px -16px rgba(0, 0, 0, 0.55),
    inset 0px -10px 18px -16px rgba(0, 0, 0, 0.25);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 320px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #f6f7fb;
}

.panel {
width: 360px;
border-radius: 18px;
border: 2px solid #111;
background: #fff;
padding: 18px;
}

.panel p {
margin: 10px 0 0 0;
opacity: 0.85;
line-height: 1.4;
}




  
    Inset shadows
    They make the element feel like it has depth inside.

Multiple box-shadows (layering)

You can stack multiple shadows by separating them with commas. This is how you get that “real UI” look:

One small, sharp shadow for contact
One bigger, softer shadow for lift
Optional glow or outline for style

.card {
  box-shadow: 0px 18px 42px rgba(0, 0, 0, 0.18);
}

.card {
  box-shadow:
    0px 2px 0px rgba(0, 0, 0, 0.18),
    0px 18px 42px rgba(0, 0, 0, 0.14);
}

.card {
  box-shadow:
    0px 2px 0px rgba(0, 0, 0, 0.16),
    0px 16px 40px rgba(0, 0, 0, 0.12),
    0px 40px 90px rgba(0, 0, 0, 0.10);
}

.card {
  box-shadow:
    0px 2px 0px rgba(0, 0, 0, 0.16),
    0px 16px 40px rgba(0, 0, 0, 0.12),
    0px 0px 0px 3px rgba(17, 17, 17, 0.10);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 320px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #f6f7fb;
}

.card {
width: 360px;
border-radius: 18px;
border: 2px solid #111;
background: #fff;
padding: 18px;
}

.card .meta {
margin-top: 10px;
display: grid;
gap: 6px;
opacity: 0.85;
}

.pill {
width: fit-content;
border: 2px solid #111;
border-radius: 999px;
padding: 6px 10px;
font-size: 13px;
background: #fff;
}




  
    Layered shadows
    
      crisp contact
      soft lift
      optional outline

box-shadow common mistakes

Too dark: beginners often use opaque black. Use alpha like rgba(0, 0, 0, 0.15).
Too blurry without offset: a huge blur at 0 0 looks like a fog halo. Add a little Y offset.
One shadow only: layering two shadows usually looks more natural than one big one.

Learn even more about box-shadow in the CSS Box Shadow Interactive Tutorial.

CSS text-shadow basics

text-shadow is like box-shadow but for text glyphs. The syntax is usually:

text-shadow: x y blur color;

Notice there’s no spread for text-shadow.

Simple text-shadow examples

Click around and see how small changes can make text clearer or messier.

.title {
  text-shadow: 0px 0px 0px rgba(0, 0, 0, 0.35);
}

.title {
  text-shadow: 0px 2px 0px rgba(0, 0, 0, 0.25);
}

.title {
  text-shadow: 0px 8px 18px rgba(0, 0, 0, 0.35);
}

.title {
  text-shadow: -4px 4px 0px rgba(0,  0, 0, 0.25);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 380px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #0c1020;
}

.block {
width: min(700px, 100%);
border-radius: 18px;
border: 2px solid rgba(255, 255, 255, 0.18);
background: linear-gradient(135deg, rgba(255, 255, 255, 0.40), rgba(255, 255, 255, 0.25));
padding: 22px;
color: #fff;
}

.title {
margin: 0 0 12px 0;
font-size: 46px;
letter-spacing: 0.5px;
}

.sub {
margin: 0;
opacity: 0.85;
line-height: 1.4;
max-width: 60ch;
}




  
    Text shadow
    A little shadow can help contrast. Too much shadow can make text harder to read.

text-shadow interactive sliders

Use sliders to learn the “feel” of each number. Keep text shadows subtle for readability.

X offset Y offset Blur radius



.title {
text-shadow: 0px 6px 18px rgba(0, 0, 0, 0.45);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 420px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #121826;
}

.hero {
width: min(760px, 100%);
border-radius: 18px;
border: 2px solid rgba(255, 255, 255, 0.14);
background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.38), rgba(255, 255, 255, 0.26));
padding: 22px;
color: #fff;
}

.title {
margin: 0;
font-size: 54px;
letter-spacing: 0.5px;
}

.note {
margin: 12px 0 0 0;
opacity: 0.85;
max-width: 65ch;
line-height: 1.4;
}




  
    Slider shadow
    Try small blur values first, then increase blur. Big blur is not always better.

Multiple text-shadows: outline and glow

Just like box-shadow, text-shadow can stack with a comma-separated list. Two classic tricks:

Outline: many tiny shadows around the text (fake stroke).
Glow: soft blurred shadows for neon vibes.

.word {
  text-shadow:
    -2px 0px 0px rgba(0, 0, 0, 0.55),
    2px 0px 0px rgba(0, 0, 0, 0.55),
    0px -2px 0px rgba(0, 0, 0, 0.55),
    0px 2px 0px rgba(0, 0, 0, 0.55);
}

.word {
  text-shadow:
    0px 0px 10px rgba(255, 255, 255, 0.55),
    0px 0px 24px rgba(255, 255, 255, 0.28);
}

.word {
  text-shadow:
    0px 2px 0px rgba(0, 0, 0, 0.25),
    0px 18px 22px rgba(0, 0, 0, 0.35);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 420px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: linear-gradient(135deg, #999999, #2b1d3a);
}

.word {
margin: 0;
font-size: 64px;
font-weight: 700;
letter-spacing: 1px;
color: #fff;
}

.hint {
margin: 14px 0 0 0;
opacity: 0.85;
max-width: 70ch;
line-height: 1.4;
color: rgba(255, 255, 255, 0.9);
}




  
    SHADOW
    Multiple text-shadows can fake an outline or create a glow.

Learn more about text-shadow in the CSS Text Shadow Interactive Tutorial.

CSS filter: drop-shadow() basics

drop-shadow() is part of the filter property. It creates a shadow based on the element’s rendered shape, not its rectangle.

That means it can shadow the visible pixels of:

transparent PNGs
SVGs
elements with transparency (depending on the content)

Syntax:

filter: drop-shadow(x y blur color);

There’s no spread value in drop-shadow().

drop-shadow vs box-shadow on transparent images

This is the big “aha” moment. When you use box-shadow on an image element, you’re shadowing its box (rectangle). With drop-shadow(), you’re shadowing the actual cut-out shape.

.figure img {
  box-shadow: 0px 22px 38px rgba(0, 0, 0, 0.28);
}

.figure img {
  filter: drop-shadow(0px 22px 24px rgba(0, 0, 0, 0.35));
}

.figure img {
  filter: drop-shadow(-12px 18px 22px rgba(0, 0, 0, 0.30));
}

.figure img {
  filter:
    drop-shadow(0px 18px 20px rgba(0, 0, 0, 0.28))
    drop-shadow(0px 4px 0px rgba(0, 0, 0, 0.12));
}

*, ::before, ::after {
  box-sizing: border-box;
}
.demo-wrap {
  min-height: 500px;
  display: grid;
  place-items: center;
  padding: 24px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  background: #f6f7fb;
}
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  width: min(860px, 100%);
}
.figure {
  border: 2px solid #111;
  border-radius: 18px;
  background: #fff;
  padding: 14px;
  display: grid;
  gap: 10px;
  justify-items: center;
}
.figure h4 {
  margin: 0;
  font-size: 14px;
  opacity: 0.85;
}
.figure img {
  width: 210px;
  height: auto;
  display: block;
}
.small {
  opacity: 0.75;
  font-size: 13px;
  text-align: center;
  max-width: 40ch;
  line-height: 1.35;
}




  
    
      Transparent PNG
      
      Try box-shadow vs drop-shadow. One follows the box, one follows the pixels.
    



  Transparent PNG
  
  drop-shadow() is usually the “correct” shadow for cut-outs.

drop-shadow interactive sliders

Same idea as before: offsets + blur. Keep it subtle and slightly offset for natural “lift”.

X offset Y offset Blur radius



.figure img {
filter: drop-shadow(0px 18px 22px rgba(0, 0, 0, 0.32));
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 520px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #f6f7fb;
}

.figure {
width: min(860px, 100%);
border: 2px solid #111;
border-radius: 18px;
background: #fff;
padding: 18px;
display: grid;
gap: 14px;
justify-items: center;
}

.figure img {
width: 320px;
height: auto;
display: block;
}

.caption {
text-align: center;
max-width: 70ch;
opacity: 0.85;
line-height: 1.4;
margin: 0;
}




  
    
    Drag X, Y, and blur. You’re editing the drop-shadow() values inside filter.

Multiple drop-shadows and filter chains

You can stack multiple drop-shadows by listing multiple functions in filter. This is handy when you want a softer “lift” shadow plus a tiny “contact” shadow.

You can also combine drop-shadow with other filter functions. Just remember: filters can be more expensive than box-shadows, so don’t slap them on 300 items in a scrolling list and then blame your laptop fan.

.art {
  filter:
    drop-shadow(0px 18px 22px rgba(0, 0, 0, 0.26))
    drop-shadow(0px 4px 0px rgba(0, 0, 0, 0.10));
}

.art {
  filter:
    drop-shadow(0px 18px 22px rgba(0, 0, 0, 0.26))
    drop-shadow(0px 4px 0px rgba(0, 0, 0, 0.10))
    brightness(1.05);
}

.art {
  filter:
    drop-shadow(-12px 18px 22px rgba(0, 0, 0, 0.28))
    drop-shadow(0px 4px 0px rgba(0, 0, 0, 0.10))
    contrast(1.06);
}



*,
::before,
::after {
box-sizing: border-box;
}

.demo-wrap {
min-height: 540px;
display: grid;
place-items: center;
padding: 24px;
font-family: ui-monospace, SFMono-Regular, monospace;
background: #f6f7fb;
}

.frame {
width: min(920px, 100%);
border: 2px solid #111;
border-radius: 18px;
background: #fff;
padding: 18px;
display: grid;
gap: 14px;
justify-items: center;
}

.row {
display: flex;
gap: 24px;
flex-wrap: wrap;
justify-content: center;
}

.art {
width: 260px;
height: auto;
display: block;
}

.note {
margin: 0;
opacity: 0.85;
line-height: 1.4;
max-width: 80ch;
text-align: center;
}




  
    
      
      
    
    filter can chain multiple drop-shadows and other effects. Use with taste (and performance in mind).

Learn more about filter: drop-shadow() in the CSS Drop Shadow Interactive Tutorial.

Shadow quality checklist and practical tips

Use transparency: shadows usually look best with alpha (not solid black).
Prefer Y offset over X for natural light: most UIs assume light from above.
Layer for realism: try two shadows (contact + lift) instead of one big blob.
Keep text readable: avoid huge blur on body text; use subtle shadows or none.
Use drop-shadow for cut-outs: it follows the pixels, not the rectangle.
Watch performance: heavy filters on many elements can be costly.

Common shadow debugging

My box-shadow looks like a halo

You probably have 0px 0px offsets with a large blur. Add a little Y offset (like 0px 12px) and reduce opacity.

My shadow is clipped or cut off

The parent might have overflow: hidden, or the element is inside a container that clips effects. For drop-shadow, clipping can also happen depending on layout. Try removing overflow clipping or adding padding around the element.

My drop-shadow is not working

Make sure you’re using filter: drop-shadow(...) (not box-shadow), and that the element actually has visible pixels. Also check if another rule overrides filter.

Wrap-up: CSS shadows (you now have superpowers)

If you remember only one thing, remember this: box-shadow is for boxes, text-shadow is for text, and drop-shadow() is for the actual visible shape. Combine subtle values with layering, and your UI will instantly feel more “real”.

Share:

Leave the first comment (Cancel Reply)

You must be logged in to post a comment.