Tell me, is there a good way to mark the gray reply of SMS? Thank you.

In the lower right corner is the send button.

I will provide some pictures, you must understand.

Figure 1: No contact can be sent, so it is displayed in gray.

Figure 2: There are contacts and short messages that can be sent, and the send button is displayed in white.

Figure 3: When sending a short message, the input box has no content and cannot be sent. It is displayed in gray.

Figure 4. When replying, the input box has no frame and cannot be sent, and it is displayed in gray.

Figure 5: When replying, the input box contains content and can be sent, which is displayed in white.