When you want your Swiper slider to fit seamlessly into your site's design, targeting the right CSS classes is essential. Swiper gives you many built-in classes such as swiper-slide, swiper-button-next, swiper-button-prev, and swiper-pagination-bullet. You can style these directly in your CSS file to control colors, spacing, fonts, borders, and more. For best results, always:

• Use class selectors rather than element selectors;
• Take advantage of Swiper's state classes, like swiper-slide-active or swiper-pagination-bullet-active, for dynamic effects;
• Keep your CSS modular and avoid overly specific selectors to make future edits easier;
• Test your styles on different screen sizes and browsers for consistency.

Consistent, well-structured custom CSS ensures your slider matches your site's brand and provides a polished user experience.