CSS Techniques for Changing Content Size Based on Viewport Height

Introduction to Changing Size with CSS

Today, considering the variety of devices including mobiles, tablets, and desktops, web designers are looking for ways to adapt web designs to different viewport sizes. For this purpose, responsive techniques are used, one of which changes content size based on viewport height. This way, the user experience improves, and users can view complete content without needing to scroll unnecessarily.

One of the main methods to achieve this goal is to use CSS properties such as vh (viewport height), which defines sizing based on a percentage of the viewport height. This unit allows you to align elements with greater flexibility and change their size based on viewport height.

As a simple example, imagine you want to design the top section of a website to have a height of 50% of the viewport height. In this case, you can use the vh unit to achieve this result. This technique not only enhances the professionalism of the website but also improves the user experience.

In this article, we will look more closely at other techniques that can be effective in designing responsive websites. This includes the use of media queries and other CSS properties to change content size based on viewport height.

Additionally, we will provide a complete example of CSS code that will help you better understand this technique. By using this code, you can add responsive properties to your website and improve user experience.

Example of CSS Code for Responsive Design

<style>
  .header {
    height: 50vh; /* height 50 percent of the viewport height */
    background-color: #4CAF50;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    color: white;
  }

  @media (max-height: 600px) {
    .header {
      font-size: 1.5em; /* change font size for smaller screens */
    }
  }
</style>

<style> - tag used to include internal CSS code.

.header - class used for styling the top part of the site.

height: 50vh; - this defines the height of this section as 50 percent of the total viewport height.

background-color: #4CAF50; - sets the background color of the top section to green.

display: flex; - this enables the element to function as a flex container.

justify-content: center; and align-items: center; - these properties center the content vertically and horizontally.

font-size: 2em; - defines the font size of the text in this section.

color: white; - sets the text color to white.

@media (max-height: 600px) - a media query that applies specific rules to screens shorter than 600 pixels.

font-size: 1.5em; - modifies the font size for smaller screens within the specified media query.