Test and visualize how different container widths respond across various screen sizes. Ideal for designing responsive layouts using fixed, fluid, and max-width containers.
Test standard container widths like `640px`, `960px`, `1140px`, or responsive values like `100%`, `80vw`, or `min(90%, 1200px)`.
Preview how your containers behave on different screen sizes like mobile, tablet, laptop, or ultra-wide monitors.
Drag the viewport slider or set custom widths to test container responsiveness.
Copy the generated container styles for immediate use in your project.
See real-time pixel dimensions and layout performance.