Using negative values - Set the bottom position of a <div> element:
document.getElementById("myDiv").style.bottom = "-100px";
<!DOCTYPE html> <html> <head> <style> #myDiv {// w ww . j a va 2 s .c o m border: 1px solid #FF0000; position: relative; } </style> </head> <body> <div id="myDiv">This is a div element.</div> <br> <button type="button" onclick="myFunction()">Set bottom position of div to -100 px</button> <script> function myFunction() { document.getElementById("myDiv").style.bottom = "-100px"; } </script> </body> </html>