fix dark-mode for modal

static/assets/css/darkmode.css

@@ -46,7 +46,7 @@ hr {
     background-color: var(--input-bg-color);
 }
 
-.form-control:focus, .dataTables_wrapper .dataTables_length select:focus, .dataTables_wrapper .dataTables_filter input:focus {
+.form-control:focus, .dataTables_wrapper .dataTables_length select:focus, .dataTables_wrapper .dataTables_filter input:focus, .modal-content {
     border-color: #1991eb;
     outline: 0;
     box-shadow: 0 0 0 2px rgba(70, 127, 207, 0.25);