To ensure that elements, divs, and containers in your HTML maintain their intended layout across different screen sizes, you should use responsive web design techniques. Here are some key strategies to achieve this:

1. Use a Responsive Framework:

   - Frameworks like Bootstrap or Foundation provide pre-built responsive grids and components that adjust automatically to different screen sizes.

2. Fluid Grids and Flexbox:

   - Use CSS Grid or Flexbox to create layouts that are flexible and can adjust to various screen sizes. These CSS modules are designed to handle complex layouts and are inherently responsive.

3. Media Queries:

   - Use CSS media queries to apply different styles based on the screen size. Media queries allow you to define specific styles for different screen resolutions and orientations.

   ```css

   @media (max-width: 768px) {

     /* Styles for screens smaller than 768px */

   }

   @media (min-width: 769px) and (max-width: 1024px) {

     /* Styles for screens between 769px and 1024px */

   }

   @media (min-width: 1025px) {

     /* Styles for screens larger than 1025px */

   }

   ```

4. Percentage-based Widths and Heights:

   - Instead of fixed pixel values, use percentages for widths and heights to allow elements to scale with the screen size.

5. Viewport Meta Tag:

   - Include the viewport meta tag in your HTML to ensure proper scaling and responsiveness on mobile devices.

   ```html

   <meta name="viewport" content="width=device-width, initial-scale=1">

   ```

6. Flexible Images and Media:

   - Ensure images and other media are responsive by setting their max-width to 100%.

   ```css

   img {

     max-width: 100%;

     height: auto;

   }

   ```

7. CSS Units:

   - Use relative units like `em`, `rem`, `vw`, and `vh` instead of fixed units like `px` to create scalable layouts.

8. CSS Grid Layout:

   - Leverage CSS Grid for complex layouts. It allows for precise control over columns and rows and adjusts naturally to different screen sizes.

   ```css

   .container {

     display: grid;

     grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));

     gap: 20px;

   }

   ```

9. Testing Across Devices:

   - Test your design on multiple devices and screen sizes to ensure it looks good everywhere. Tools like Chrome DevTools can simulate different screen sizes and devices.

10. Flexbox Layout:

    - Use Flexbox to create flexible layouts that adjust to different screen sizes.

    ```css

    .container {

      display: flex;

      flex-wrap: wrap;

    }

    .item {

      flex: 1 1 200px; /* flex-grow, flex-shrink, flex-basis */

    }

    ```

By combining these techniques, you can create responsive layouts that adjust smoothly to different screen sizes and ensure that your elements and containers remain well-organized and visually appealing.