Answers for "footer fixed bottom bootstrap 5"

sticky footer bootstrap 3

<style>
.footer {
   position: fixed;
   left: 0;
   bottom: 0;
   width: 100%;
   background-color: red;
   color: white;
   text-align: center;
}
</style>

Fixed footer in Bootstrap

footer {
    position: fixed;
    height: 100px;
    bottom: 0;
    width: 100%;
}