I do not think Bootstrap has its own classes for this, so you can change the classes in your CSS to always adjust the bottom element.
For this I created a class .embaixo
for the button and set the class .card
as below:
.embaixo{
position: absolute;
left: 5%;
bottom: 20px;
width: 90%;
}
.card{
padding-bottom: 40px;
}
The absolute positioning is for the button to always be in the bottom , and the padding
in the .card
is to compensate for the difference because the absolute positioning does not affect the fluidity and can be over of the text.
View in JSFiddle .