Make footer stick to the bottom

Is there a way to stick the footer to the bottom of the page?
I know the issue is pretty old, but in this theme it doesn’t work for me.
Here’s what i did. It doesn’t put the footer down. What am i missing?

body {
height:100%;
}
.site {
height:100%;
min-height:100%;
position: relative;
}
.site-inner {
margin: 0 auto;
position: relative;
height:100%;
min-height:100%;
}
.site-content {
height:100%;
min-height: 100%;
}
.site-footer {
min-height:115px;
}