To achieve the same behavior moving flex elements to the top or bottom (rather than to the right or to the left), you need to use mb-auto ( margin-bottom: auto ) and mt-auto ( margin-top: auto ), set flex-direction to column and apply the align-items-(start|end) class. You can accomplish this result either horizontally or vertically. See the Pen Bootstrap 4 Flexbox with Auto-Margins Tricks by SitePoint ( on CodePen. ml-auto classes to the right-most or left-most position respectively, and the other elements to the opposite direction. You can see this as moving the item with the. ml-auto class ( margin-left: auto in regular CSS). mr-auto class to the item, which stands for margin-right: auto in regular CSS, or also position some elements to the left of a specified item by using the Bootstrap. With some minimal styling, here’s what you get:Ĭombining Flexbox with auto margins results in some cool tricks.įor example, look at the above layout: you can position elements to the right of an item by adding a Bootstrap. col-sm will each automatically be 25% wide from the small breakpoint and up. col-* classes), the available space will automatically and equally be divided among those columns. If you create a grid layout with multiple columns without specifying the column width (i.e using the. Thanks to Flexbox, you can easily divide the available space between multiple columns in the same row. With Bootstrap 4 and its flexbox-based grid, you achieve a more realistic column (just like in a table), as columns in the same row will take the same height. See the Pen Bootstrap 4 2-Column Layout by SitePoint ( on CodePen. If you build the same layout with Bootstrap 4, this is what you have: See the Pen Bootstrap 3 2-Column Layout by SitePoint ( on CodePen. If you build this layout with Bootstrap 3, it will look like this: Thanks to Flexbox, you can easily achieve things like same-height columns or same-width columns, which you could only accomplish with CSS hacks before.ĬSS float and clearfix techniques to build layouts have been among such hacks, which made it hard to build and debug complex layouts.įor example, consider a two-column layout. col-sm-6.īootstrap Grid Layouts with Flexbox vs Floats You don’t need to add multiple classes if you want to specify the same width for different screen sizes just add the class with the smallest breakpoint. col-xl-*: designed for extra large screens that have a width that equals to or is greater than 1200px. col-lg-*: designed for large screens with the width >= 992px col-md-*: designed for medium screens with the width >= 768px col-sm-*: designed for small screens with the width equals to or greater than 576px col-xs-*: designed for extra small screens of less than 576px width The Bootstrap grid system provides these additional column classes: ColumnĪ column is what makes a block in the grid. RowĪ row serves as a logical container for columns. The container is the outer wrapper for the grid layout. Let’s now look at the core components of the Bootstrap grid. The sum of all columns has to be equal to 12.) col-*-* needs to be replaced by the breakpoint specifier - such as xs, sm, md, lg, xl - and the second * needs to be filled with the column span size. You can build a layout using Bootstrap’s grid system by applying a bunch of Bootstrap classes. Grid systems are an important element of a CSS framework, since building complex layouts without a powerful and flexible grid system can be an intimidating task.Īmong the new features of the latest Bootstrap grid system, you’ll find the xl (extra large) grid breakpoint, corresponding to an extra large screen size, and the use of Flexbox instead of floats as the underlying layout mechanism. Introduction to the Bootstrap Grid System
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