I use react native elements button to create the buttons. The button style is applied from theme. Button style is
Button: (props,theme)=>({
loading: false,
raised: true,
color: theme.colors.primary,
buttonStyle: { borderRadius: 20, elevation: 0, overflow: 'hidden'},
containerStyle:{
backgroundColor: theme.colors.tertiary,
overflow: 'hidden',
marginHorizontal: 20,
marginVertical: 10,},
titleStyle: {
color: theme.colors.tertiary,
}
}),
how to remove the white around the corners?

Change the backgroundColor prop of the containerStyle to transparent