Add scrollbar when shared files overlap their container

app/stylus/components/FileSharing.styl

@@ -1,4 +1,8 @@
 [data-component='FileSharing'] {
+	display: flex;
+	flex-direction: column;
+	height: 100%;
+	
 	> .sharing-toolbar {
 		> .share-file {
 			cursor: pointer;
@@ -16,6 +20,9 @@
 	}
 
 	> .shared-files {
+		flex-grow: 1;
+		overflow-y: scroll;
+
 		> .file-entry {
 			background-color: rgba(0,0,0,0.1);
 			border-radius: 5px;
@@ -24,6 +31,10 @@
 			display: flex;
 			margin-top: 0.5rem;
 			
+			&:last-child {
+				margin-bottom: 1.5rem;
+			}
+
 			> .file-avatar {
 				height: 2rem;
 				border-radius: 50%;