feat(ShowEnvelope): Share-Button hinzugefügt

- CSS einstellen.

EnvelopeGenerator.Web/wwwroot/css/card.css

@@ -43,6 +43,10 @@
 	color: #fff;
 	padding: 1.875rem;
 	max-width: 15.625rem;
+	display: flex;
+	flex-direction: column;
+	justify-content: center;
+	align-items: center;
 }
 
 .dd-card-preview a {
@@ -54,6 +58,23 @@
 	text-decoration: none;
 }
 
+	.dd-card-preview button {
+		border-width: 0;
+		align-items: center;
+		background-color: transparent;
+		color: white;
+		margin: 15% 0 0 0;
+		transition: color 0.25s ease;
+
+	}
+
+		.dd-card-preview button:hover {
+			color: #bebebe;
+		}
+
+		.dd-card-preview span {
+		}
+
 .dd-card-info {
 	padding: 1rem 0 0 1.875rem;
 	position: relative;