@media (max-width: 768px) {
    .t-popup__close,
    .t-popup__close_mobile,
    [class*="close"],
    button[class*="close"],
    div[class*="close"] {
        background: #274C78 !important;
        background-color: #274C78 !important;
    }
    
    .t-popup__close::before,
    .t-popup__close::after,
    .t-popup__close_mobile::before,
    .t-popup__close_mobile::after,
    [class*="close"]::before,
    [class*="close"]::after {
        background: white !important;
        background-color: white !important;
    }
}