adding search icon to input box

Answer 1

Put the image into the span, for example using background-image, then give it a relative position and move it to the left so it overlaps the right end of the search box, for example:

#g-search-button {
  display: inline-block;
  width: 16px;
  height: 16px;
  position: relative;
  left: -22px;
  top: 3px;

  background-color: black;  /* Replace with your own image */
}

Working example on JSBin

Note: This is not my answer, i've found it here