#messenger {
  z-index: 1030;
  width: 50px;
  height: 50px;

}

#scroll-to-top {
    z-index: 1030;
    width: 40px;
    height: 40px;
}

    #scroll-to-top img {
        filter: drop-shadow(0 0 0 #001F3F)
        drop-shadow(2px 0 0 #001F3F)
        drop-shadow(-2px 0 0 #001F3F)
        drop-shadow(0 2px 0 #001F3F)
        drop-shadow(0 -2px 0 #001F3F);
    }