* { margin: 0; padding: 0; } #parentNode { position: relative; width: 200px; height: 200px; margin: 0 auto; border: 10px solid #000; background-color: #f09; } #childNode { position: absolute; left: 0; top: 0; padding: 30px; border: 6px solid #f90; background-color: #0099ff; } #selectBox { display: inline-block; height: 40px; line-height: 40px; margin: 50px 0 0 100px; font-size: 18px; }