+
+@media screen and (min-width: 768px) {
+ .modal:before {
+ display: inline-block;
+ vertical-align: middle;
+ content: " ";
+ height: 100%;
+ }
+
+ .modal-dialog {
+ display: inline-block;
+ text-align: left;
+ vertical-align: middle;
+ min-width: 500px;
+ width: 40vw;
+ max-width: 900px;
+ }
+}
+