Added styling for birthday member component

Introduce new CSS styles to ensure consistent layout and design for the birthday member section. These styles handle width, padding, text alignment, and font styling for improved visual presentation.

frontend/src/app/birthdays/birthdays.component.scss

@@ -0,0 +1,14 @@
+.birthdayMember {
+  width: 33%;
+  min-width: 250px;
+  padding-bottom: 50px;
+  text-align: center;
+}
+
+.birthdayMember img {
+  padding-bottom: 15px;
+}
+
+.birthdayMember p {
+  font-family: 'opensans-bold', sans-serif;
+}