Fix Select in Firefox (#518)

* fix select items width in firefox

* fix generic menu items width in firefox

Author: ariser

src/components/GenericMenu.tsx

@@ -72,6 +72,7 @@ export const Arrow = styled.svg`
 export const GenericMenuItem = styled.div`
   display: flex;
   width: 100%;
+  width: -moz-available;
   width: -webkit-fill-available;
   width: fill-available;
   width: stretch;

src/components/Select/common/SelectStyled.tsx

@@ -193,7 +193,6 @@ export const HiddenSelectElement = styled.select`
 export const SelectGroupContainer = styled.div`
   display: flex;
   flex-direction: column;
-  align-items: flex-start;
   justify-content: center;
   width: -webkit-fill-available;
   width: fill-available;