This Image Gallery Box is a sleek and responsive solution built to showcase products, portfolios, or collections in a professional and user-friendly layout. Designed using HTML5, CSS3, and vanilla JavaScript, it ensures fast performance and smooth user interaction without relying on any external libraries.

The gallery features a main fullscreen image viewer with soft transitions and a dark background for visual focus. Below the main image, a scrollable thumbnail strip allows users to click and preview any image instantly. As each thumbnail is clicked, it highlights with an elegant border and transition effect — keeping user navigation intuitive and interactive.

The gallery also includes Next (⟩) and Previous (⟨) navigation buttons, making it easy to browse through images in a linear sequence. The transitions are smooth, and the layout is fully responsive across all screen sizes — from desktops to smartphones.

Feature Highlights:

• Fullscreen image viewer with thumbnail strip

• Clickable thumbnails with active highlight effect

• Smooth image transitions on slide change

• Next/Previous buttons for manual navigation

• Auto-scaling for mobile and tablet responsiveness

• Built with pure HTML, CSS, and vanilla JavaScript

• Lightweight, no dependencies, easy to integrate

• Clean modern design with minimal distraction

• Scrollable thumbnails without visible scrollbar

• Elegant hover and transition animations