CSS Border Style Previewer
Tune border width, style, color, and radius while you watch the preview update. Copy the CSS when the edge looks right on buttons, cards, or inputs.
Presets
borderStyle: solid; borderWidth: 2px; borderColor: #000000; borderRadius: 4px; backgroundColor: #ffffff;
Border properties that matter
A CSS border is usually style + width + color, with radius handling corners. Style alone does nothing visible until width is set.
Core properties
- border-style: line pattern
- border-width: thickness
- border-color: color
- border-radius: corner rounding
Style keywords
- solid — single continuous line
- dashed — rectangular dashes
- dotted — round dots
- double — two parallel lines
- groove / ridge / inset / outset — 3D-ish edges (subtle on thin widths)
Quick patterns
Basic button border
.button {
border: 2px solid #3b82f6;
border-radius: 4px;
padding: 8px 16px;
}Hover border
.hover-border {
border: 1px solid transparent;
transition: border-color 0.3s ease;
}
.hover-border:hover {
border-color: #ef4444;
}Gradient border
.gradient-border {
border: 4px solid transparent;
background-image:
linear-gradient(white, white),
linear-gradient(45deg, #ff0080, #7928ca);
background-origin: border-box;
background-clip: content-box, border-box;
}Practical habits
- Reuse tokens. Put width, style, color, and radius in CSS variables so cards and inputs stay aligned.
- Scale on small screens. Thick decorative borders can crowd mobile layouts—thin them in a media query when needed.
- Watch contrast. Borders used as affordances (inputs, focus) need to stay visible against the surface behind them.
- Keep motion light. Animating wide, high-contrast borders can feel noisy; prefer color or radius changes for hover.
Related tools
Frequently asked questions
How do I round only some corners?
Set individual radii such as border-top-left-radius and border-bottom-right-radius, or use the four-value border-radius shorthand.
What is the difference between border and outline?
Borders take part in the box model and can differ per side. Outlines sit outside the layout, usually look the same on all sides, and are common for focus rings because they do not shift size.
How can I get a border-like look without changing layout?
Use outline, or a box-shadow like 0 0 0 2px #000. Neither adds to width/height the way border does.
Can I animate borders?
Width, color, and radius animate well with transitions. Switching between styles like solid and dashed does not interpolate cleanly—crossfade opacity or swap classes instead.
How do I keep borders consistent across a design system?
Store width, style, color, and radius as CSS variables and reuse them. That keeps cards, inputs, and buttons aligned when the brand shifts.
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