# Vertical tabs with light bar

> A glowing bar slides up and down a thin track to sit next to the active option.

- Category: [Radio buttons](https://library.aimran.es/components/radios)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-rd-vline
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

This works as a side menu more than a form field: the sections of an account page, a dashboard sidebar with overview, activity and settings, or the chapters of a documentation page. The glowing bar slides to the active item, so you always know where you are. Vertical tabs in HTML, CSS and a bit of JavaScript.

It looks best with four to seven items of similar length. On dark themes the glow stands out nicely; on light ones you may want to soften it so the bar does not look blurry.

## Code

### HTML

```html
<div class="uv-rdv"><span class="ln"><i></i></span><button>Overview</button><button class="on">Activity</button><button>Settings</button><button>Help</button></div>
```

### CSS

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

.uv-rdv {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .2em;
  padding-left: 1.2em;
}

.uv-rdv .ln {
  position: absolute;
  left: 0;
  top: .3em;
  bottom: .3em;
  width: 2px;
  border-radius: 2px;
  background: color-mix(in srgb,var(--fg) 12%,transparent);
}

.uv-rdv .ln i {
  position: absolute;
  left: -1px;
  width: 4px;
  border-radius: 3px;
  background: var(--c1);
  box-shadow: 0 0 8px var(--c1),0 0 18px color-mix(in srgb,var(--c1) 70%,transparent);
  transition: transform calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1),height calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-rdv button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  text-align: left;
  padding: .55em .8em;
  border: 0;
  border-radius: .6em;
  background: none;
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  cursor: pointer;
  transition: all calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-rdv button:hover {
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 6%,transparent);
}

.uv-rdv button.on {
  color: var(--c1);
  font-weight: 650;
}
```

### JavaScript

```js
document.querySelectorAll(".uv-rdv").forEach(el => {
  const i=el.querySelector(".ln i"),bs=[...el.querySelectorAll("button")];const mv=b=>{i.style.height=b.offsetHeight*.7+"px";i.style.transform="translateY("+(b.offsetTop+b.offsetHeight*.15-el.querySelector(".ln").offsetTop)+"px)"};bs.forEach(b=>b.addEventListener("click",()=>{bs.forEach(x=>x.classList.remove("on"));b.classList.add("on");mv(b)}));requestAnimationFrame(()=>mv(el.querySelector("button.on")))
});
```

### React

```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-rdv {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .2em;
  padding-left: 1.2em;
}

.uv-rdv .ln {
  position: absolute;
  left: 0;
  top: .3em;
  bottom: .3em;
  width: 2px;
  border-radius: 2px;
  background: color-mix(in srgb,var(--fg) 12%,transparent);
}

.uv-rdv .ln i {
  position: absolute;
  left: -1px;
  width: 4px;
  border-radius: 3px;
  background: var(--c1);
  box-shadow: 0 0 8px var(--c1),0 0 18px color-mix(in srgb,var(--c1) 70%,transparent);
  transition: transform calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1),height calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-rdv button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  text-align: left;
  padding: .55em .8em;
  border: 0;
  border-radius: .6em;
  background: none;
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  cursor: pointer;
  transition: all calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-rdv button:hover {
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 6%,transparent);
}

.uv-rdv button.on {
  color: var(--c1);
  font-weight: 650;
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  const i=el.querySelector(".ln i"),bs=[...el.querySelectorAll("button")];const mv=b=>{i.style.height=b.offsetHeight*.7+"px";i.style.transform="translateY("+(b.offsetTop+b.offsetHeight*.15-el.querySelector(".ln").offsetTop)+"px)"};bs.forEach(b=>b.addEventListener("click",()=>{bs.forEach(x=>x.classList.remove("on"));b.classList.add("on");mv(b)}));requestAnimationFrame(()=>mv(el.querySelector("button.on")))
}

export default function RdVline() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-rdv"><span className="ln"><i></i></span><button>Overview</button><button className="on">Activity</button><button>Settings</button><button>Help</button></div>
      </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 “Vertical tabs with light bar” block (Radio buttons) from AIMRAN Library to my project.

## What it is
A glowing bar slides up and down a thin track to sit next to the active option.

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

## 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
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-rdv {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .2em;
  padding-left: 1.2em;
}

.uv-rdv .ln {
  position: absolute;
  left: 0;
  top: .3em;
  bottom: .3em;
  width: 2px;
  border-radius: 2px;
  background: color-mix(in srgb,var(--fg) 12%,transparent);
}

.uv-rdv .ln i {
  position: absolute;
  left: -1px;
  width: 4px;
  border-radius: 3px;
  background: var(--c1);
  box-shadow: 0 0 8px var(--c1),0 0 18px color-mix(in srgb,var(--c1) 70%,transparent);
  transition: transform calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1),height calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-rdv button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  text-align: left;
  padding: .55em .8em;
  border: 0;
  border-radius: .6em;
  background: none;
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  cursor: pointer;
  transition: all calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-rdv button:hover {
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 6%,transparent);
}

.uv-rdv button.on {
  color: var(--c1);
  font-weight: 650;
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  const i=el.querySelector(".ln i"),bs=[...el.querySelectorAll("button")];const mv=b=>{i.style.height=b.offsetHeight*.7+"px";i.style.transform="translateY("+(b.offsetTop+b.offsetHeight*.15-el.querySelector(".ln").offsetTop)+"px)"};bs.forEach(b=>b.addEventListener("click",()=>{bs.forEach(x=>x.classList.remove("on"));b.classList.add("on");mv(b)}));requestAnimationFrame(()=>mv(el.querySelector("button.on")))
}

export default function RdVline() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-rdv"><span className="ln"><i></i></span><button>Overview</button><button className="on">Activity</button><button>Settings</button><button>Help</button></div>
      </div>
    </>
  );
}
```

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