change default avatar picture

core/css/buttons.css

@@ -202,3 +202,40 @@ button.formbutton a {
 		font-size: 0px;
 	}
 }
+
+*.wdropdown > button {
+	min-width: 130px;
+	min-height: 30px;
+	background: var(--primary-container-background);
+	border: var(--primary-container-border);
+	cursor: pointer;
+	text-align: left;
+	margin: 2px 0;
+}
+
+*.wdropdown > div.select {
+	position: absolute;
+	display: none;
+	flex-direction: column;
+	background: var(--secondary-container-background);
+	border: var(--secondary-container-border);
+	border-top: none;
+	overflow-y: auto;
+	max-height: 280px;
+}
+
+*.wdropdown.active > div.select {
+	display: inline;
+}
+
+*.wdropdown.active > div.select > * {
+	display: block;
+}
+
+*.wdropdown > div.select > button {
+	background: none;
+	border: none;
+	cursor: pointer;
+	margin: 4px;
+	text-align: left;
+}