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Customize Component Styling

Holt components are designed for customization. This guide covers three approaches, from quick overrides to full component modifications.

Override with the class Prop​

Every Holt component accepts a class prop for adding or overriding styles:

use crate::components::*;

view! {
    // Add rounded corners
    <Button class="rounded-full">"Rounded Button"</Button>

    // Add shadow
    <Card class="shadow-xl">"Elevated Card"</Card>

    // Override padding
    <CardContent class="p-8">"Extra Padding"</CardContent>
}

Classes are merged with tailwind_fuse, which handles conflicts intelligently. Your custom classes take precedence when there's overlap:

// Base button has `rounded-md`, but `rounded-full` wins
<Button class="rounded-full">"Pill Button"</Button>

Modify Component Source​

For deeper changes, copy the component into your project and modify it directly.

1. Copy the Component​

Find the component source in Holt's repository and copy it to your project:

your-project/
└── src/
    └── components/
        └── button.rs  // Your modified copy

2. Modify the Styles​

Edit the base classes to match your design:

// Original
let base_classes = "inline-flex items-center justify-center rounded-md text-sm font-medium";

// Your modification
let base_classes = "inline-flex items-center justify-center rounded-xl text-base font-bold";

3. Use Your Version​

Import your modified component instead of Holt's:

use crate::components::button::Button;

Add Custom Variants​

Extend components with new variant options.

1. Define the Variant​

Add a new enum variant:

#[derive(Default, Clone, Copy)]
pub enum ButtonVariant {
    #[default]
    Default,
    Destructive,
    Outline,
    Secondary,
    Ghost,
    Link,
    // Your new variant
    Gradient,
}

2. Add Variant Styles​

Update the style function:

fn button_variant_classes(variant: ButtonVariant) -> &'static str {
    match variant {
        ButtonVariant::Default => "bg-primary text-primary-foreground hover:bg-primary/90",
        ButtonVariant::Destructive => "bg-destructive text-destructive-foreground hover:bg-destructive/90",
        ButtonVariant::Outline => "border border-input bg-background hover:bg-accent hover:text-accent-foreground",
        ButtonVariant::Secondary => "bg-secondary text-secondary-foreground hover:bg-secondary/80",
        ButtonVariant::Ghost => "hover:bg-accent hover:text-accent-foreground",
        ButtonVariant::Link => "text-primary underline-offset-4 hover:underline",
        // New variant
        ButtonVariant::Gradient => "bg-gradient-to-r from-purple-500 to-pink-500 text-white hover:from-purple-600 hover:to-pink-600",
    }
}

3. Use the New Variant​

<Button variant=ButtonVariant::Gradient>"Gradient Button"</Button>

Tips​

  • Start with class prop - It handles most customization needs without copying code
  • Copy components sparingly - Only copy when you need structural changes, not just style tweaks
  • Keep variants semantic - Name variants by purpose (Gradient), not appearance (PurplePink)
  • Document your changes - When you copy and modify a component, note what you changed and why