Clases CSS para footer siempre este abajo

* {

-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
sizing: border-box;
}

body, html{
padding: 0;
margin:0;
width: 100%;
height: 100%;
}

body{
display: table;
-moz-display: table;
-webkit-display: table;
-o-display: table;
-ms-display: table;
height: 100%;
}

footer{
color: #fff;
background: #525252;
padding: 10px;
display: table-row;
-moz-display: table-row;
-webkit-display: table-row;
-o-display: table-row;
-ms-display: table-row;
filter: display(display= table-row;;);
-khtml-display: table-row;
height: 1px;
}