Add pointer cursor to button class by default

src/style/atoms/_button.scss

@@ -6,6 +6,7 @@
     background: #fff;
     font: 900 #{rem(16px)}/1 $font-sans;
     color: $color-text;
+    cursor: pointer;
     border-radius: 100vh;
     border: none;
     text-decoration: none;