How can I remove the white part of the button?

# compose

[chanjungskim]

How can I remove the white part of the button?

[chanjungskim]

Button(
                onClick = {
                    paymentType = OrderData.PaymentType.NICEPAY
                },
                shape = RoundedCornerShape(0.dp),
                contentPadding = PaddingValues(0.dp),
                interactionSource = NoRippleInteractionSource(),
                colors = ButtonDefaults.buttonColors(
                    containerColor = Color.Red001,
                    contentColor = Color.Green001
                ),
                modifier = Modifier
                    .weight(0.5f)
                    .height(tabHeight)
                    .drawToggleBorder(
                        isSelected = paymentType == OrderData.PaymentType.NICEPAY,
                        strokeWidth = 1.dp
                    )
            ) {
                Text(
                    text = "Hello World",
                    fontSize = fontSize,
                    color = Color.Black
                )
            }

[chanjungskim]

fun Modifier.drawToggleBorder(
    isSelected: Boolean,
    strokeWidth: Dp,
    defaultBorderColor: androidx.compose.ui.graphics.Color = Color.Gray01,
    borderColor: androidx.compose.ui.graphics.Color = Color.Black
) = composed(
    factory = {
        val density = LocalDensity.current
        val strokeWidthPx = density.run { strokeWidth.toPx() }

        Modifier.drawBehind {
            val width = size.width
            val height = size.height

            if (isSelected) {
                drawRect(
                    color = Color.White
                )
                drawLine(
                    color = borderColor,
                    start = Offset(x = 0f, y = 0f),
                    end = Offset(x = 0f, y = height),
                    strokeWidth = strokeWidthPx
                )
                drawLine(
                    color = borderColor,
                    start = Offset(x = 0f, y = 0f),
                    end = Offset(x = width, y = 0f),
                    strokeWidth = strokeWidthPx
                )
                drawLine(
                    color = borderColor,
                    start = Offset(x = width, y = 0f),
                    end = Offset(x = width, y = height),
                    strokeWidth = strokeWidthPx
                )
            } else {
                drawRect(
                    color = Gray016
                )
                drawLine(
                    color = borderColor,
                    start = Offset(x = 0f, y = height),
                    end = Offset(x = width, y = height),
                    strokeWidth = strokeWidthPx
                )
                drawLine(
                    color = defaultBorderColor,
                    start = Offset(x = 0f, y = 0f),
                    end = Offset(x = 0f, y = height),
                    strokeWidth = strokeWidthPx
                )
                drawLine(
                    color = defaultBorderColor,
                    start = Offset(x = width, y = 0f),
                    end = Offset(x = width, y = height),
                    strokeWidth = strokeWidthPx
                )
            }
        }
    }
)