canvas { 
        position: absolute;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        display:block;
        background:#fdfdfd;
        border-radius:12px; 
    }

    .range-input {
        z-index: 100;
        position: absolute;
        width: 20vw;
        left: calc(50vw - 10vw);
        top: 66vh;
    }