mynav.css

nav {
    background: rgb(0, 0, 0);
    border-radius: 20;
    border-top-left-radius: 20;
    border-top-right-radius: 20;
    border-bottom-right-radius: 20;
    border-bottom-left-radius: 20;
    border-style: none;
    padding-top: 0;
    padding-bottom: 10px;
    height: 61px;
    padding-right: 0px;
    padding-left: 24px;
}

div.dropdown-menu {
    background-color: rgb(34, 34, 34);
}

li {
    padding: 10px;
    animation-name: fade-down;
    animation-duration: 3s;
}
@keyframes fade-down {
    0%{
      opacity: 0;
      transform: translateY(-30px) scale(0.9);
    }
    100%{
      opacity: 1;
      transform: translateY(0px) scale(1);
    }
}

a span {
    color: white;
    font-size: 2rem;
    transition: all 1s;
    
}

a span:hover {
    color: rgb(230, 112, 28);
    font-size: 2.5rem;
    text-shadow: 1px 1px 10px chocolate;
}

li a:hover {
    color: white !important;
}

@keyframes pulse {
    0% {
        transform: scaleX(1);
    }

    50% {
        transform: scale3d(1.05, 1.05, 1.05);
    }

    to {
        transform: scaleX(1);
    }
}
.collapse.navbar-collapse ul li::after{
    content: '';
    width: 0;
    height: 4px;
    display: block;
    background-color: white;
    color: white;
    transition: all 1s;
   
}
.collapse.navbar-collapse ul li:hover::after{
    width: 100%;
}
a.dropdown-item:hover {
    animation-name: pulse;
    animation-duration: 1s;
}

.navbar-toggler{
    background-color:#ECF8F9;
}

.collapse{
    background-color: rgb(0, 0, 0);
    transition-duration: 0s;
    transition-delay: 0s;
}