.compose-form__publish-button-wrapper button {
    visibility: hidden;
}

.compose-form__publish-button-wrapper button:before {
    visibility: visible;
    content: 'Beep!';
    display: block;
    width: 100%;
    padding: 7px;
	margin-top:-7px;
    border-radius: 3px;
    background-color: #595aff;
}

.button.button--block:hover:before {
    background-color: #6364ff;
}