How to make images center horizontally in div

How to center the image in the Bootstrap div: Best choice: Use Flexbox (add the d-flex and justify-content-center classes) for old projects: Use text-align (set img tag to inline-block; and add text-align: center;)

Make the picture stable in Bootstrap's div: Secrets for centering horizontally

Many students have encountered this problem: the picture cannot be centered in the div of Bootstrap, and it feels uncomfortable to watch it. In fact, the solution is not that complicated. The key is to understand the layout mechanism of Bootstrap and some CSS tips. This article will take you to get it done step by step, allowing you to completely get rid of the problem of centering pictures, and the code path will be extremely smooth from now on. After reading, you will master a variety of methods and be able to choose the optimal solution according to actual conditions.

Let’s first review the basics of Bootstrap. Bootstrap uses Flexbox and Grid systems to layout, both of which can be easily centered. Flexbox is more flexible and suitable for a variety of scenarios, while the Grid system is more suitable for complex page layouts.

Let’s start with the most commonly used Flexbox. To make the image center horizontally in the div, you only need to add two classes d-flex and justify-content-center to the parent div. d-flex enables Flexbox layout, justify-content-center aligns child elements (that is, pictures) horizontally.

 <code class="html"><div class="d-flex justify-content-center"> <img src="/static/imghwm/default1.png" data-src="your-image.jpg" class="lazy" alt="Your Image"> </div></code>

It's that simple? Yes, that's that simple! Of course, you may also need to set the max-width attribute of the image to prevent the image from being too large and breaking the container.

 <code class="html"><div class="d-flex justify-content-center"> <img src="/static/imghwm/default1.png" data-src="your-image.jpg" class="lazy" alt="Your Image"   style="max-width:90%"> </div></code>

This is just the most basic usage. If your image is not fixed in height, you may also need to be vertically centered. At this time, you can add align-items-center class. This class will center the child elements in the vertical direction.

 <code class="html"><div class="d-flex justify-content-center align-items-center"> <img src="/static/imghwm/default1.png" data-src="your-image.jpg" class="lazy" alt="Your Image"   style="max-width:90%"> </div></code>

Perfect! Now, no matter how big or small the picture is, it can be steadily centered horizontally and vertically in the div.

However, this is not the only way. If your project is old or doesn't want to use Flexbox for some reason, you can also use the text-align attribute. But this method is only applicable to in-line elements, so the img tag needs to be set to display: inline-block; .

 <code class="html"><div style="text-align: center;"> <img src="/static/imghwm/default1.png" data-src="your-image.jpg" class="lazy" alt="Your Image"   style="max-width:90%"> </div></code>

This method is more traditional and is not as convenient as Flexbox when dealing with complex layouts.

Let’s talk about possible problems. For example, the width and height ratio of the picture is incorrect, resulting in the unsatisfactory centering effect. At this time, you may need to resize the image itself, or use the object-fit attribute of CSS to control the display of the image.

In addition, if your div has padding or margin, it may also affect the centering effect. Double-check your CSS styles to make sure there is no unnecessary style interference.

In short, there are many ways to center the picture in the div of Bootstrap. Which method to choose depends on your specific needs and project situation. Flexbox is the most recommended way because it is simple and efficient, and has good compatibility. However, only by understanding the advantages and disadvantages of various methods can we make the best choice in actual development. Remember, the readability and maintainability of the code are also important, so try to keep the code concise and clear. I hope this article can help you easily solve the problem of centering pictures, and I wish you a happy programming!

The above is the detailed content of How to make images center horizontally in div. For more information, please follow other related articles on the PHP Chinese website!