egroupware_official/doc/etemplate2/pages/getting-started/styling.md

# Styling

Our overall styling is a combination of our site-wide style (pixelegg), etemplate2.css
and [Shoelace](https://shoelace.style/) styles

Some handy excerpts:

## Global CSS variables

```css
:root {
	--primary-background-color: #4177a2;
	--highlight-background-color: rgba(153, 204, 255, .4);

	--label-color: #000000;
	/* For fixed width labels - use class 'et2-label-fixed'*/
	--label-width: 8em;

	--input-border-color: #E6E6E6;
	--input-text-color: #26537C;

	--warning-color: rgba(255, 204, 0, .5);
	--error-color: rgba(204, 0, 51, .5);

}
```

Use these variables instead of specific colors to make maintenance and customisation easier. In most places, we can
use Shoelace's [design tokens](https://github.com/shoelace-style/shoelace/blob/current/src/themes/light.css ) as well

```html:preview
<style>    
.customStyle {
    background-color: var(--primary-background-color, white);
    border: 1px solid var(--input-border-color);
    color: var(--label-color);
    
    /* Shoelace gives us many variables as well */
    padding: var(--sl-spacing-medium);
}

.customStyle.warning {
    /* Local override of the label color */
    --label-color: red;
    
    background-color: var(--warning-color);
    border-width: 2px;
}
</style>

<et2-box class="customStyle">customStyle</et2-box>
<et2-box class="customStyle warning">customStyle + warning</et2-box>
```

## Useful CSS classes

### hide

Hides the element using css```display: none```

### hideme

Hides the element using css```display: none !important;```

### et2-label-fixed

Use on a widget to force its label to have a fixed width. This helps line up labels and widgets into columns without
having to use a grid, which allows them to reflow if needed. Set the CSS variable ```--label_width``` to change how much
space the labels get.

These widgets are in an et2-vbox:

|                ![fixed label example #1](/assets/images/styling_et2-label-fixed_2.png )                 |
|:-------------------------------------------------------------------------------------------------------:|  
|                                     *Without et2-label-fixed class*                                     |
|                 ![fixed label example #2](/assets/images/styling_et2-label-fixed_1.png)                 |
|                               *Fixed width labels using et2-label-fixed*                                |
|                 ![fixed label example #3](/assets/images/styling_et2-label-fixed_3.png)                 |
| *--label_width CSS variable changed for more space*            <br/>Note how 'Responsible' widget wraps |

## Directly Customising Widgets

If you need to customise an individual widget further, you can
use [CSS Parts](https://shoelace.style/getting-started/customizing#css-parts)
or [Custom Properties](https://shoelace.style/getting-started/customizing#custom-properties) to directly override the
widget's internal styling.

## Examples

### Custom Button Color

```html:preview
<et2-button class="tomato-button">Custom button</et2-button>
<style>
  .tomato-button::part(base) {
    background: var(--sl-color-neutral-0);
    border: solid 1px tomato;
  }

  .tomato-button::part(base):hover {
    background: rgba(255, 99, 71, 0.1);
  }

  .tomato-button::part(base):active {
    background: rgba(255, 99, 71, 0.2);
  }

  .tomato-button::part(base):focus-visible {
    box-shadow: 0 0 0 3px rgba(255, 99, 71, 0.33);
  }

  .tomato-button::part(label) {
    color: tomato;
  }
</style>
```

### Fixed width labels

Here we've used the class `et2-label-fixed` and overridden the standard width of `8em` to `--label-width: 16em;`. Adjust
the viewport width to see the widgets reflow when there's not enough horizontal space. No grid is used, which allows the
reflow from 2 columns to 1 column.

```html:preview
<style>
.fixed-example {
    --label-width: 16em;
}
</style>
<et2-select class="fixed-example et2-label-fixed" label="Select"></et2-select>
<et2-select-number class="fixed-example et2-label-fixed" label="Select number from list"></et2-select-number>
```