.wrapperxx {
  position: relative;
  display : block;
  margin: auto;
  width: 350px;
  height: 180px;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
img {
  position: absolute;
  left: 0;
  top: 0;
}

.signature-pad {
  position: absolute;
  left: 0;
  top: 0;
  width:350px;
  height:180px;
}