BirdNET-stream/www/assets/styles/menu.css

nav {
    position: fixed;
    top: 0;
    left: 0;
    --nav-width: 20em;
    z-index: 10;
}

.toggler{
    z-index:2;
    height: 50px;
    width: 50px;
    position: absolute;
    cursor: pointer;
    opacity: 0;
}

.hamburger{
    position: absolute;
    top: 0;
    left: 0;
    height: 40px;
    width: 40px;
    padding: 0.6rem;  
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.hamburger > div{
    position: relative;
    top: 0;
    left: 0;
    background: black;
    height: 2px;
    width: 75%;
    transition: all  0.4s ease;
    color: #000;

}

.hamburger > div::before,
.hamburger > div::after{
    content: '';
    position: absolute;
    top: -7px;
    background: black;
    width: 100%;
    height: 2px;
    transition: all  0.4s ease;
}

.hamburger > div::after{
    top: 7px;
}

.toggler:checked + .hamburger > div{
    background: rgba(0,0,0,0);
}

.toggler:checked + .hamburger > div::before{
    top: 0;
    transform: rotate(45deg);
    background: black;
}

.toggler:checked + .hamburger > div::after{
    top: 0;
    transform: rotate(135deg);
    background: black;
}

.menu{
    height: 100vh;
    width: 0;
    visibility: hidden;
}

.toggler:checked ~ .menu{
    width: fit-content;
    height: fit-content;
    background-color: rgba(255, 255, 255, 1)!important;
}

.menu > ul{
    display: flex;
    flex-direction: column;
    position: fixed;
    width: 0;
    height: 100vmax;
    padding-left: 1em;
    padding-right: 1em;
    margin-top: 2em;
    visibility: hidden;
    background-color: white;
    z-index: 1;
}

.menu > ul > li{
    list-style: none;
    padding: 0.5rem;
}

.menu > ul > li > a{
    color: black;
    text-decoration: none;
    font-size: 2rem;
}

.toggler:checked ~ .fill  {
    background: white;
    position: absolute;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--nav-width);
}

.toggler:checked ~ .menu > ul{
    width: 20em;
    transition: fit-content .5s ease;
    opacity: 1;
    transition: opacity .5s, visibility .5s, height .5s, width .5s;
    visibility: visible;
}

.toggler:checked ~ .menu > ul > li > a:hover{
    color: orange;
}