@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {  
    /* Put your IE-only styles here. Works for IE 10 & IE 11*/
    .header-navigation .header-navigation-items .ie-1011-flex-grow-1 {
        flex-grow: 1;
    }

    .ie-1011-min-width-530 {
        min-width: 530px;
    }
}