bootstrap screen sizes
The Bootstrap grid system has four classes: xs (for phones - screens less than 768px wide) sm (for tablets - screens equal to or greater than 768px wide) md (for small laptops - screens equal to or greater than 992px wide) lg (for laptops and desktops - screens equal to or greater than 1200px wide)
.row bootstrap
.row{ display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; }
bootstrap grid
<!----------------------- BOOTSTRAP GRID SYSTEM ------------------------> This code will create 4 boxes placed side by side, which will be dynamically positioned, according to the size of the screen. We define the following behavior: <!-- Desktop Display: we have 4 columns per row (each occupies 3 units out of 12) --> class = "col-lg-3" <!-- display large with 12/3 = 4 columns --> <!-- Tablet Display: we have 3 columns per row (each occupies 4 units out of 12) --> class = "col-md-4" <!-- display medium with 12/4 = 3 columns --> <!-- Mobile Display: we have 2 columns per row (each occupies the 6 units of 12) --> class = "col-sm-6" <!-- display small with 12/6 = 2 columns --> <!-- CODE --> <div class="row"> <div class="col-lg-3 col-md-4 col-sm-6" style="background-color:red; border:1px solid black;"> One of four columns </div> <div class="col-lg-3 col-md-4 col-sm-6" style="background-color:yellow; border:1px solid black;"> One of four columns </div> <div class="col-lg-3 col-md-4 col-sm-6" style="background-color:green; border:1px solid black;"> One of four columns </div> <div class="col-lg-3 col-md-4 col-sm-6" style="border:1px solid black;"> One of four columns </div> </div>
boostrap grid
<div class="row"> <div class="col-6 col-sm-4">.col-6 .col-sm-4</div> <div class="col-6 col-sm-4">.col-6 .col-sm-4</div> <!-- Force next columns to break to new line at md breakpoint and up --> <div class="w-100 d-none d-md-block"></div> <div class="col-6 col-sm-4">.col-6 .col-sm-4</div> <div class="col-6 col-sm-4">.col-6 .col-sm-4</div> </div>
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