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“bootstrap 4 image size to fit” Code Answer's you have to set the width of image to 100%, for that you can use Bootstrap class "w-100". keep in mind that "container-fluid" and "col-12" class sets left and right padding to 15px and "row" class sets left and right margin to "-15px" by default. make sure to set them to 0.
Answer: Use the CSS max-width Property You can simply use the CSS max-width property to auto-resize a large image so that it can fit into a smaller width <div> container while maintaining its aspect ratio.
Use <img src = "images/dummy_image. png" class = "img-responsive" width = "100%" /> for fitting the column. This will fit your image width-wise into the column and will automatically modify the height (keeping the aspect ratio in mind), so you do not have to worry about image getting illogically resized.
Try adding this to your stylesheet:
img {
width: 100%;
}
Update: As an alternative (as pointed out in this answer's comments by @JasonAller), you could add class="img-responsive" to each img element. This applies max-width: 100%; and height: auto; to the image so that it scales nicely to the parent element. See the Bootstrap docs for more info.
The classname for bootstrap v4 is img-fluid
Bootstrap v4 docs
With Bootstrap 4 you must use use class="img-fluid", class="img-responsive" will work in 3.x.
Sometimes on dynamic content when you have no control over what users put in, class="img-responsive" would not work. And 'width: 100%' for each image is tricky as well. So I am using:
img {max-width: 100%;}
Beware that bootstrap columns have padding as well; that may be unexpected.
The following:
div class="col-sm-6" style="padding:0"
worked for me.
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