.hamburger {
    position: relative;
    display: none;
    width: 25px;
    height: 30px;
    cursor: pointer;
    margin: auto 0;
    z-index: 1000;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background: none;
    outline: none;
    border: none;
}

.hamburger .bar,
.hamburger::after,
.hamburger::before {
    content: "";
    display: block;
    width: 100%;
    height: 3px;
    background-color: #404040;
    border-radius: 5px;
    margin: 5px 0;
    -webkit-transition: 0.8s ease;
    transition: 0.8s ease;
}

.hamburger.is-active::before {
    -webkit-transform: rotate(45deg) translate(6px, 6px);
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.is-active::after {
    -webkit-transform: rotate(-45deg) translate(5px, -5px);
    transform: rotate(-45deg) translate(5px, -5px);
}

.hamburger.is-active .bar {
    opacity: 0;
}

@media screen and (max-width: 768px) {
    .hamburger {
        display: block;
    }
}