manage conflict (generic way) use toast to show error (#588)

* manage conflict (generic way) use toast to show error

* fix httpservice after merge conflict, adapt to use new repository

src/BlazorAdmin/wwwroot/css/admin.css

@@ -153,6 +153,53 @@ a, .btn-link {
     overflow: hidden !important;
 }
 
+.toast {
+    display: none;
+    padding: 1.5rem;
+    color: #fff;
+    z-index: 99999;
+    position: absolute;
+    width: 25rem;
+    top: 2rem;
+    border-radius: 1rem;
+    left: 50%;
+}
+
+.toast-icon {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    padding: 01rem;
+    font-size: 2.5rem;
+}
+
+.toast-body {
+    display: flex;
+    flex-direction: column;
+    flex: 1;
+    padding-left: 1rem;
+}
+
+.toast-body p {
+    margin-bottom: 0;
+}
+
+.toast-visible {
+    display: flex;
+    flex-direction: row;
+    animation: fadein 1.5s;
+}
+
+@keyframes fadein {
+    from {
+        opacity: 0;
+    }
+
+    to {
+        opacity: 1;
+    }
+}
+
 @media (max-width: 767.98px) {
     .main .top-row:not(.auth) {
         display: none;