# Inset fill sweep (B 146)

Category: Buttons  
Tags: inset-fill, outline, rectangle, box-shadow, left-to-right  
Page: https://designforai.dev/snippet/btn-146

## Prompt

An outline button (transparent, 2px #111827 border, 6px radius, 14px semibold dark text, 12px by 24px padding) that fills from the left on hover using an inset box-shadow growing from 0 to 200px horizontal spread, text turning white, 300ms ease-out. Active fills pure black. Focus 2px dark outline offset 3px.

## HTML

```html
<button class="btn-146">Read more</button>
```

## CSS

```css
.btn-146 {
  font: 600 14px/1 system-ui,sans-serif;
  color: #111827;
  background: transparent;
  border: 2px solid #111827;
  border-radius: 6px;
  padding: 12px 24px;
  cursor: pointer;
  box-shadow: inset 0 0 0 0 #111827;
  transition: box-shadow .3s ease-out,color .3s
}
.btn-146:hover {
  box-shadow: inset 200px 0 0 0 #111827;
  color: #fff
}
.btn-146:focus-visible {
  outline: 2px solid #111827;
  outline-offset: 3px
}
.btn-146:active {
  box-shadow: inset 200px 0 0 0 #000;
  border-color: #000
}
```