#DNTCaptchaInputText.form-control {
    width: 100%;
}

.captcha-container {
    display: flex;
    align-items: baseline;
}

    .captcha-container #dntCaptchaImg {
        max-width: 100%;
        height: auto;
    }

    .captcha-container .input-group {
        width: 100%;
    }