#app_popup .modal-body { padding: 0; } #app_popup button.close { position: absolute; right: 0; display: flex; align-items: center; justify-content: center; line-height: 30px; width: 30px; height: 30px; background: #000; opacity: 1; color: #fff; border-radius: 50%; font-size: 18px; top: -10px; right: -10px; }