.back-to-top {
    cursor: pointer;
    position: fixed;
    bottom: 20px;
    right: 20px;
    display:none;
    /* put it before zindex-tooltip:1070 !default; */
    z-index:1069; 
   background-color: transparent!important;
   background: #0000003d!important;
   border-color: transparent!important;
   color: #333333a3!important;
   padding: 15px 15px;
}