.km-viewport-popup.dx-overlay-content {
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    max-height: var(--km-popup-available-height, 100dvh) !important;
    min-height: 0 !important;
    overflow: hidden;
}
.km-viewport-popup > .dx-popup-title,
.km-viewport-popup > .dx-popup-bottom { flex-shrink: 0; }
.km-viewport-popup > .dx-popup-content {
    flex: 1 1 auto;
    min-height: 0;
    height: auto !important;
    overflow: auto;
    overscroll-behavior: contain;
}