crater/resources/assets/sass/components/hamburgers.scss

.hamburger {
    display: inline-block;
    cursor: pointer;
    transition-property: opacity, filter;
    transition-duration: 0.15s;
    transition-timing-function: linear;
    font: inherit;
    color: inherit;
    text-transform: none;
    background-color: transparent;
    border: 0;
    margin: 0;
    overflow: visible;
}

.hamburger-box {
    width: 24px;
    height: 24px;
    display: inline-block;
    position: relative;
 }

.hamburger-inner {
    display: block;
    top: 50%;
    left: 4.5px;
    right: 4.5px;
    margin-top: -2px;
}

.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
    height: 2px;
    background-color: $header-buttons-font-color;
    border-radius: 2px;
    position: absolute;
    transition-property: transform;
    transition-duration: 0.15s;
    transition-timing-function: ease;
}

.hamburger-inner::before,
.hamburger-inner::after {
    content: "";
    display: block;
    width:100%;
}

.hamburger-inner::before {
    top: -5px;
}

.hamburger-inner::after {
    bottom: -5px;
}

.hamburger--arrowturn.is-active .hamburger-inner {
    transform: rotate(-180deg);
}

.hamburger--arrowturn.is-active .hamburger-inner::before {
    transform: translate3d(3px, 1px, 0) rotate(45deg) scale(0.7, 1);
}

.hamburger--arrowturn.is-active .hamburger-inner::after {
    transform: translate3d(3px, -1px, 0) rotate(-45deg) scale(0.7, 1);
}