## Progress bar
Code ([progress_bar.rs](./progress_bar.rs)):
```rust
Progress::new(
0,
Style::new(gradient, Color::Grey, Color::Reset),
Dimension::new(0, 2, 100, 0),
OnRender::new(&update_handler),
);
```

Code ([input_field.rs](./input_field.rs)):
```rust
Input::new(
"Initial placeholder".to_string(),
Style::new(vec![], Color::White, Color::Black),
Dimension::new(0, 4, 100, 0),
renderer,
);
```
