Bootstrap 3 Apply CSS on Mobile View Only

Just use the appropriate media queries in your CSS, eg

@media (max-width: 767px) {
    /* CSS goes here */
}

Bootstrap defines the following widths

See http://css-tricks.com/css-media-queries/ for some more information on media queries.

There are also responsive utilities, you can add classes to certain elements to either show or hide them at certain viewport sizes.

.hidden-xs or .visible-xs

http://getbootstrap.com/css/#responsive-utilities

You can use responsive display classes https://getbootstrap.com/docs/4.3/utilities/display/ in Bootstrap 4

So for example, you want to hide a specific element for only phones (in both portrait & landscape mode or xs and sm), you can do

<div class="big_image d-none d-md-block">
</div>

What it does is set display:none by default and makes it visible only from md and above.

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