@media(max-width: 450px) {
    .comment-heading {
        display: none;
    }

    .comment-new form {
        padding-top: 10px;
        padding-bottom: 15px;
    }

    .comment-input {
        width: 150px;
        height: 25px;
    }

    .comment-input::placeholder {
        font-size: 10px;
    }

    .comment-submit {
        height: auto;
        width: auto;
        font-size: 10px;
        padding: 3px 6px;
    }
}