Add sample image option (#136)

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>
Reviewed-on: #136

src/css/detect.css

@@ -111,6 +111,15 @@
   max-width: 100px;
 }
 
+.dialog-buttons {
+  align-items: center;
+}
+
+.avn-dialog-button {
+  font-size: 17px;
+  align-self: center;
+}
+
 /*Additional styles for small format landscape orientation*/
 @media (max-height: 450px) and (orientation: landscape) {
   .detect-grid {