.nav-menu__button-active {
    width: 31px;
    height: 14px;
    margin-top: 20px;
    margin-bottom: 8px;
    margin-right: 10px;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    display: none;
    -ms-flex-order: 1;
}

.nav-menu__button-active span:after,
.nav-menu__button-active span:before {
    content: "";
    position: absolute;
    left: 0;
    top: -10px;
}
.nav-menu__button-active span:after {
    top: 10px;
}
.nav-menu__button-active span {
    position: relative;
    display: block;
}
.nav-menu__button-active span,
.nav-menu__button-active span:after,
.nav-menu__button-active span:before {
    width: 100%;
    height: 2px;
    background-color: #282828;
    -webkit-transition: all 0.3s;
    transition: all 0.3s;
    border-radius: 2px;
}
.nav-menu__button-active.on span {
    background-color: transparent;
}
.nav-menu__button-active.on span:before {
    -webkit-transform: rotate(45deg) translate(5px, 5px);
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-menu__button-active.on span:after {
    -webkit-transform: rotate(-45deg) translate(9px, -9px);
    transform: rotate(-45deg) translate(9px, -9px);
}