I have these 3 boxes
That's how they appear on desktop, but I need to make them be responsive, and when someone open the page on a smartphone, the 3 images can't stay in a horizontal line, but in the vertical. Here's the HTML
<div class="gallery-140721">
<div class="gallery-card-140721">
<a href="" target="_blank"></a><img
src="galeria-hotsite-modelo-molas-vl-1.jpg" alt="modelo 1"></a>
<p class="gallery-title-140721">|MOLAS ENSACADAS|</p>
<p class="gallery-text-140721">Cama Box Herval Lofty</p>
</div>
<div class="gallery-card-140721">
<a href=""
target="_blank"><img src="galeria-hotsite-modelo-molas-vl-2.jpg" alt="modelo 1"></a>
<p class="gallery-title-140721">|MOLAS MAXSPRING|</p>
<p class="gallery-text-140721">Cama Box Herval Irland</p>
</div>
<div class="gallery-card-140721">
<a href=""
target="_blank"><img src="galeria-hotsite-modelo-molas-vl-3.jpg" alt="modelo 1" /></a>
<p class="gallery-title-140721">|Molas Bonnel|</p>
<p class="gallery-text-140721">Cama Box Herval Troya</p>
</div>
</div>
I'm really new to all of this, then sorry if it is a really dumb question...