@media screen and (max-width: 980px) {
    .tmenu-mobile .tmenu-mobile__burger .tmenu-mobile__burger-lines,
    .tmenu-mobile .tmenu-mobile__burger .tmenu-mobile__burger-lines:before,
    .tmenu-mobile .tmenu-mobile__burger .tmenu-mobile__burger-lines:after {
        background-color: #ffffff !important;
    }
}