.wrapper-signature {
    position: relative;
    width: 100%;
    height: 200px;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
    border: solid 1px #ddd;
    margin: 10px 0px;
}
.signature-pad {
    position: absolute;
    left: 0;
    top: 0;
    width:100%;
    height:200px;
}