![]() Once we have defined our flex container, some initial values come into play. How does this element act? How do the children of this element act? The answers relate to their outer and inner display models. You can apply this thinking to any box in CSS. This concept of elements having an outer display type, which defines how they behave as a box on the page (plus an inner display type) dictating how their children behave is quite useful. See the Pen Smashing Flexbox Series 1: display: inline-flex by Rachel Andrew ( on CodePen. The children of our inline flex container behave in the same way that children of our block flex container behave the difference is how the container itself behaves in the overall layout. a flex container that acts like an inline level element, with children that participate in flex layout. We can also define our container with a value of inline-flex which is like using display: inline flex, i.e. If you have a paragraph followed by a flex container, both of these things behave as we have become accustomed to block elements behaving. The flex container acts like any other block on your page. This is something you might never have really thought about but probably understand anyway. The inner display type is flex, so items directly inside our container will participate in flex layout. The outer display type of our flex container is block it acts like a block level element in normal flow. ![]() ![]() When we add display: flex, we are really defining display: block flex. In the Display Module Level 3, each value of display is described as actually being a combination of two things: an inner display model, and an outer display model. Let us spend a little while thinking about what display: flex really means. See the Pen Smashing Flexbox Series 1: display: flex by Rachel Andrew ( on CodePen. In order to use Flexbox, you need an element that will be the flex container. In this article, we will take a detailed look at what actually happens when you add display: flex to your stylesheet. We’ll have a look at the things Flexbox was designed for, what it really does well, and why we might not choose it as a layout method. In a short series of articles, I’m going to spend some time in detailed unpacking of Flexbox - in the same way I have done in the past with grid. In fact, many of the places where people find Flexbox difficult or confusing are really due to this attempt to make it a method for grid layout. Instead, however, we got Flexbox first and, due to it being better at creating grid-type layouts than floats, we ended up with a lot of Flexbox-based grid systems. Window.In my ideal world, CSS Grid and Flexbox would have arrived together, fully formed to make up a layout system for the web. HandleResize() // Call it first time component mount Then the flex items of the ul could be left-aligned with justify-content: flex-start. Using the code posted in the question, we could create a new flex container that wraps the current flex container ( ul), which would allow us to center the ul with justify-content: center. But unless there is a fixed number of boxes per row, and each box is fixed-width, this is currently not possible with flexbox. The challenge is to center a group of flex items and left-align them on wrap.
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