Square Outline CSS button
Sharp black outline with spaced capitals that fills on hover. Hover, click and tab to it to see every state.
CSS
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');
.btn {
display: inline-flex;
align-items: center;
justify-content: center;
gap: .5em;
padding: 14px 28px;
font-family: 'Inter', sans-serif;
font-size: 13px;
font-weight: 600;
line-height: 1.2;
letter-spacing: 0.179999999999999993338661852249060757458209991455078125em;
text-transform: uppercase;
color: #0f172a;
background: rgba(255, 255, 255, 0);
border: 1.5px solid #0f172a;
border-radius: 0px;
cursor: pointer;
text-decoration: none;
white-space: nowrap;
-webkit-tap-highlight-color: transparent;
transition: transform 200ms cubic-bezier(.2,.8,.2,1), box-shadow 200ms cubic-bezier(.2,.8,.2,1), filter 200ms cubic-bezier(.2,.8,.2,1), background 200ms cubic-bezier(.2,.8,.2,1), color 200ms cubic-bezier(.2,.8,.2,1);
}
.btn:hover {
background: #0f172a;
color: #ffffff;
}
.btn:active {
transform: translateY(1px) scale(0.979999999999999982236431605997495353221893310546875);
transition-duration: 100ms;
}
.btn:focus-visible {
outline: 3px solid #0f172a;
outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
.btn {
transition: none;
animation: none;
}
}HTML
<button class="btn" type="button">
Shop now
</button>How this button is built
- Background: transparent, so the button takes the colour of whatever is behind it.
- Type: Inter, weight 600, 13px, uppercase, letter-spacing 18px, in #0f172a.
- Shape: square corners with 14px × 28px padding, plus a 1.5px solid border.
- Interaction: on hover it switches to #0f172a with #ffffff text, and it squishes slightly when clicked, with 200ms transitions.
- Accessibility: a visible
:focus-visiblering for keyboard users, and all motion turns off underprefers-reduced-motion.
How to use it
- Copy the CSS into your stylesheet. The
@importline loads the Inter font from Google Fonts. Move it to the top of your file, or drop it if you already load the font. - Paste the HTML where you want the button. It works on
<button>,<a>and<input type="submit">. - Change the label, or rename the
.btnclass if it clashes with your framework. Want a different colour or size? Open it in the editor, change it visually, and copy the new code.