.dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
 }
 .dropdown-backdrop{
     position:static;
     z-index:0;
 }

.navbar-light .navbar-nav .nav-link{ color:white; }

.ml{
margin-left:auto;
}
.mr{
margin-right:auto;

}

.foot{
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background-color: red;
  color: white;
  text-align: center;
}