.anim-btn {
  transition: all 0.2s;
}
.anim-btn:hover {
  gap: 25px !important;
}

#mainNav .navbar-nav > li.nav-item > a.nav-link {
  position: relative;
  display: inline-block;
}
#mainNav .navbar-nav > li.nav-item > a.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0px;
  left: 0;
  width: 100%;
  height: 1px;
  background: #000;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
}
#mainNav .navbar-nav > li.nav-item > a.nav-link.active::after {
  transform: scaleX(1);
}
#mainNav .navbar-nav > li.nav-item > a.nav-link:hover::after, #mainNav .navbar-nav > li.nav-item > a.nav-link.active::after {
  transform: scaleX(1);
}