.mMainNavgation ul li ul {
  display: none;
}

@media screen and (max-width: 640px) {
  .mMainNavgation ul li:hover ul {
    display: flex;
  }

}


.mMainNavgation .current-menu-parent ul {
  display: flex;
}

.mMainNavgation .current-menu-item ul{
  display: flex;
}