# Coloured floating label

> The label sits inside the field and floats to the top, smaller and colored, when you start typing.

- Category: [Inputs](https://library.aimran.es/components/inputs)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-in-float
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

A floating label input keeps forms compact without losing the label once someone types, which is the problem with plain placeholders. It suits a login screen, the shipping address step of a checkout or the contact form of a dental clinic. Click in and the label glides to the top, shrinks and takes your main color.

It is at its best on mobile, where vertical space is short. Keep labels to a word or two, since they shrink to three quarters of their size. For long questions, a regular label above the field reads better.

## Code

### HTML

```html
<label class="uv-if"><input placeholder=" "><span>Email</span></label>
```

### CSS

```css
.uv-if {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-if {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  position: relative;
  display: block;
  width: 16em;
  font-size: var(--s);
}

.uv-if input {
  width: 100%;
  box-sizing: border-box;
  height: 3.4em;
  padding: 1.2em 1em .4em;
  border: 0;
  border-radius: .9em;
  font: inherit;
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 6%,transparent);
  outline: none;
  box-shadow: inset 0 0 0 1px color-mix(in srgb,var(--fg) 12%,transparent);
  transition: box-shadow calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-if span {
  position: absolute;
  left: 1em;
  top: 50%;
  color: color-mix(in srgb,var(--fg) 50%,transparent);
  translate: 0 -50%;
  transform-origin: left;
  pointer-events: none;
  transition: all calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-if input:focus {
  box-shadow: inset 0 0 0 2px var(--c1),0 0 0 4px color-mix(in srgb,var(--c1) 18%,transparent);
}

.uv-if input:focus+span,.uv-if input:not(:placeholder-shown)+span {
  top: .95em;
  transform: scale(.75);
  color: var(--c1);
}
```

### React

```tsx
import type { CSSProperties } from "react";

const css = `
.uv-if {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  position: relative;
  display: block;
  width: 16em;
  font-size: var(--s);
}

.uv-if input {
  width: 100%;
  box-sizing: border-box;
  height: 3.4em;
  padding: 1.2em 1em .4em;
  border: 0;
  border-radius: .9em;
  font: inherit;
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 6%,transparent);
  outline: none;
  box-shadow: inset 0 0 0 1px color-mix(in srgb,var(--fg) 12%,transparent);
  transition: box-shadow calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-if span {
  position: absolute;
  left: 1em;
  top: 50%;
  color: color-mix(in srgb,var(--fg) 50%,transparent);
  translate: 0 -50%;
  transform-origin: left;
  pointer-events: none;
  transition: all calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-if input:focus {
  box-shadow: inset 0 0 0 2px var(--c1),0 0 0 4px color-mix(in srgb,var(--c1) 18%,transparent);
}

.uv-if input:focus+span,.uv-if input:not(:placeholder-shown)+span {
  top: .95em;
  transform: scale(.75);
  color: var(--c1);
}
`;

export default function InFloat() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-if"><input placeholder=" " /><span>Email</span></label>
      </div>
    </>
  );
}
```

## Prompt for AI assistants

Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…):

````text
I want to add the “Coloured floating label” block (Inputs) from AIMRAN Library to my project.

## What it is
The label sits inside the field and floats to the top, smaller and colored, when you start typing.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)
- Text: "Email"

## What I need
1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing.
2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file.
3. Expose the settings above as props (or CSS variables) with those values as defaults.
4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens.
5. Make it look right in light and dark mode.
6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support.
7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result.

## Reference code
```tsx
import type { CSSProperties } from "react";

const css = `
.uv-if {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  position: relative;
  display: block;
  width: 16em;
  font-size: var(--s);
}

.uv-if input {
  width: 100%;
  box-sizing: border-box;
  height: 3.4em;
  padding: 1.2em 1em .4em;
  border: 0;
  border-radius: .9em;
  font: inherit;
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 6%,transparent);
  outline: none;
  box-shadow: inset 0 0 0 1px color-mix(in srgb,var(--fg) 12%,transparent);
  transition: box-shadow calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-if span {
  position: absolute;
  left: 1em;
  top: 50%;
  color: color-mix(in srgb,var(--fg) 50%,transparent);
  translate: 0 -50%;
  transform-origin: left;
  pointer-events: none;
  transition: all calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-if input:focus {
  box-shadow: inset 0 0 0 2px var(--c1),0 0 0 4px color-mix(in srgb,var(--c1) 18%,transparent);
}

.uv-if input:focus+span,.uv-if input:not(:placeholder-shown)+span {
  top: .95em;
  transform: scale(.75);
  color: var(--c1);
}
`;

export default function InFloat() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-if"><input placeholder=" " /><span>Email</span></label>
      </div>
    </>
  );
}
```

Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````