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In some responsive scenarios you’ll see that it’s necessary to have columns exceeding 12 units in a single. Advanced Bootstrap LayoutsĪs you create different responsive layouts you find that some scenarios require more complex combinations of rows & columns to make “things fit” on multiple devices.
![responsive grids bootstrap responsive grids bootstrap](https://i.stack.imgur.com/RTeOv.png)
Here are several more examples that demonstrate various Bootstrap grid layouts using different breakpoints. Therefore, you only need to use the class for the smallest device width you want to support. The smaller grid classes also apply to larger screens unless overriden specifically for larger screens.Columns will stack vertically (and become full-width) on xs screens unless you use a specific col-xs-* class in your HTML markup.Key points to remember about breakpoints and grid sizes: For example,Ĭombine the classes to use change column widths on different grid sizes…. To enable or “use” a grid size, you simply specify it using the appropriate col-*-* class in your HTML markup. For example, col-md-3 would be 25% width on medium size screens, and then you could add col-xs-6 to make the same column 50% width on the smallest screens. The various breakpoints are combined with the column units to create different column layouts on different devices. The upcoming Bootstrap 4 grid will add a new xl breakpoint to accomodate the widest high-res Desktop screens. lg - for large screen widths like desktops >= 1200 px.md - for medium screen widths like tablets and laptops >= 992 px.xs - for the smallest screen widths like smartphones = 768 px.These grid sizes enable you to change the layout of columns to best match different screen widths and devices_ the essence of responsive design. Bootstrap uses CSS media queries to create responsive breakpoints that establish a boundary for each grid size. Each grid “size” encompasses a range that is designed to best-fit typical device screen widths such as that of desktops, laptops, tablets and smartphones. The Bootstrap 3 grid comes in four (4) sizes to accomodate different screen (or viewport) widths. In addition to the concept of column width, Bootstrap has different “breakpoints” or grid sizes. The columns consume a percentage width of the parent container. To enable or “set” a column width in your layout, simply use the appropriate col-*-* class in your HTML markup. So for example, col-md-3 would be a column that takes up 3 of the 12 units (or 25%) across in a row. Bootstrap’s grid columns are identified by different col-(breakpoint)-(units) CSS classes. This makes adapting to a variety of layouts much easier. The reason Bootstrap has a 12-unit grid (instead of 10, 16, etc.) is that 12 evenly divides into 6 (halves), 4 (quarters) and 3 (thirds). The Magic of Bootstrap’s Grid - Container > Row > Columns Horizontal layout across the page is relevant because screen width is an important consideration for responsive design. Only columns should be the immediate children of rows. Each row is divided horizontally using Bootstrap’s column classes col-*. row is made complete with columns (col-*). There are other reasons Bootstrap uses the negative margins including simpler CSS, nesting and column wrapping which is discussed later in this article.
![responsive grids bootstrap responsive grids bootstrap](https://i.pinimg.com/originals/63/2b/98/632b98168d67248772f74bd3556c7c55.jpg)
But, as you can see here this doesn’t work well since the first & last columns rendered visually, can be different than the actual first & last columns in the HTML markup of any given row. Some grid systems instead adjust the padding (or margin) on the first/last columns using CSS child selector logic. The “negative margin” approach isn’t just a gimmick. This evens up the gutters of the leftmost & rightmost columns with the outer edge of the container. Instead of using a specific class like `.first` or `.last` on those outer grid columns, Bootstrap uses negative margins. The outer columns (leftmost & rightmost) need to have 1/2 of the gutter (15px) on the outside to keep spacing consistent. The effective gutter displayed between neighboring columns in 30px. In the case of Bootstrap, the gutter is created using padding of 15px around each column. There are several reasons why the “negative margin” approach is used in Bootstrap.Īll grid systems have spacing or “gutters” around columns. The end result is no visual spacing (margin or padding) on the sides of the row within the container. row uses negative margins (-15px) to counteract the padding (15px) of the container. Responsive containers were newly introduced in Bootstrap version 4.4.
![responsive grids bootstrap responsive grids bootstrap](https://downloadpsd.cc/wp-content/uploads/Responsive-Bootstrap-Grid-PSD-Freebie.jpg)
Extra small devices - screen width less than 576px (īootstrap 4 simple container (.container class)īootstrap 4 fluid container (.container-fluid class)