#js-container {
    /* border: 3px solid yellow; */
    width: 40%;
    height: 90vh;
    display: flex;
    position: relative;
    margin: 0 auto;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none; 
    -o-user-select: none;
    user-select: none;
}

@media screen and (max-width: 767px) {
    #js-container {
        width: 80%;
    }
}

.canvas {
    position: absolute;
    top: 0;
    left: 0;
    /* width: 99%;
    height: auto;
    max-width: 600px;
    max-height: 800px; */
    z-index: 3;
    /* border: 3px solid red; */
} 

.imm_back{
    position: absolute;
    /* top: 0; */
    width: 100%;
    height: auto;
    z-index: 2;
    display: block;
    margin: 0;
    /* border: 3px solid green; */
}