Wrap all content right above the footer element, set the min-height calc function to 100% of viewport height minus the footer height:
.wrap{
min-height: calc(100vh - 100px);
}
Wrap all content right above the footer element, set the min-height calc function to 100% of viewport height minus the footer height:
.wrap{
min-height: calc(100vh - 100px);
}