# Undo toast with timer
> Confirms an action with an “Undo” button and a thin line that shrinks to show how long you have left.
- Category: [Toasts](https://library.aimran.es/components/toasts)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-toast-undo
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham
## Where to use it
The friendliest alternative to an “Are you sure?” dialog. In a task manager, archiving a task happens at once, and this undo toast gives people a few seconds to change their mind. Gmail made the pattern familiar, so users get it straight away. The shrinking line shows the time left without a countdown.
Only offer undo if you can really reverse the action, which usually means waiting until the toast is gone before deleting for good. Five seconds suits most cases; for bulk actions, like archiving fifty emails, give people a little longer.
## Code
### HTML
```html
);
}
```
## 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 “Undo toast with timer” block (Toasts) from AIMRAN Library to my project.
## What it is
Confirms an action with an “Undo” button and a thin line that shrinks to show how long you have left.
## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)
- Text: "Item archived"
## 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-zu {
font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
position: relative;
width: 20em;
height: 14em;
font-size: var(--s);
}
.uv-zu>.fire {
position: absolute;
left: 50%;
top: 50%;
translate: -50% -50%;
padding: .8em 1.25em;
border: 0;
border-radius: 999px;
font: inherit;
font-weight: 600;
color: #fff;
background: var(--c1);
cursor: pointer;
transition: transform calc(0.25s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}
.uv-zu .toast {
position: absolute;
z-index: 2;
left: 50%;
bottom: .5em;
display: flex;
align-items: center;
gap: .75em;
width: 18em;
padding: .85em;
border-radius: 1em;
color: var(--fg);
background: var(--bg);
box-shadow: inset 0 0 0 1px color-mix(in srgb,var(--fg) 10%,transparent),0 18px 45px rgba(0,0,0,.18);
opacity: 0;
pointer-events: none;
overflow: hidden;
transform: translate(-50%,2em);
}
.uv-zu .toast span {
display: grid;
gap: .12em;
flex: 1;
}
.uv-zu .toast small {
opacity: .5;
}
.uv-zu .undo {
border: 0;
font: inherit;
font-size: .72em;
font-weight: 700;
color: var(--c1);
background: transparent;
cursor: pointer;
}
.uv-zu .toast>i {
position: absolute;
left: 0;
bottom: 0;
width: 100%;
height: 3px;
background: var(--c1);
transform-origin: left;
}
.uv-zu .toast.show {
animation: uv-zu calc(5s / var(--k)) cubic-bezier(.25,.1,.25,1);
}
.uv-zu .toast.show>i {
animation: uv-zu-time calc(4.2s / var(--k)) linear forwards;
}
.uv-zu .toast.done b {
text-decoration: line-through;
opacity: .5;
}
@keyframes uv-zu {
0% {
opacity: 0;
transform: translate(-50%,2em);
}
8%,88% {
opacity: 1;
transform: translate(-50%,0);
pointer-events: auto;
}
100% {
opacity: 0;
transform: translate(-50%,1em);
}
}
@keyframes uv-zu-time {
to {
transform: scaleX(0);
}
}
`;
// 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 b=el.querySelector(".fire"),t=el.querySelector(".toast");b.addEventListener("click",()=>{t.classList.remove("show");void t.offsetWidth;t.classList.add("show")});el.querySelector(".undo").addEventListener("click",()=>{t.classList.add("done");t.querySelector("b").textContent="Action undone"});
}
export default function ToastUndo() {
const ref = useRef(null);
useEffect(() => {
const el = ref.current?.firstElementChild;
return el ? setup(el) : undefined;
}, []);
return (
<>
Item archivedYou can restore it now.
);
}
```
Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````