.containerScratch {
    border: 3px solid yellow;
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
    user-select: none;
}

.canvasScratch {
    position: absolute !important;
    top: 0;
}