.scrollToTopBtn {
    width: 40px;
    height: 40px;
    position: fixed;
    right: 30px;
    bottom: 30px;
    display: none;
    cursor: pointer;
}

.noselect {
  -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
     -khtml-user-select: none; /* Konqueror HTML */
       -moz-user-select: none; /* Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; /* Non-prefixed version, currently
                                  supported by Chrome and Opera */
}