<style>
    @import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400&display=swap');

    .form,
    .contact-form-button-submit {
        font-family: 'Open Sans', sans-serif !important;
    }

    .contact-form-name,
    .contact-form-email,
    .contact-form-email-message {
        border: none !important;
        border-radius: 4px !important;
        padding: 10px 0 !important;
        box-shadow: rgba(0, 0, 0, 0.12) 0px 1px 3px, rgba(0, 0, 0, 0.24) 0px 1px 2px !important;
        margin: 10px 0 !important;
        display: block !important;
        width: 100% !important;
        max-width:100%!important;
    }

    .contact-form-button-submit {
        border: none !important;
        background-color: #2BC48A !important;
        color: #fff !important;
        padding: 5px 10px !important;
        border-radius: 5px !important;
        width: 100% !important;
        max-width:100%!important;
        font-size: 20px !important;
    }

    .contact-form-button-submit:hover {
        cursor: pointer !important;
    }
 </style>
<div class="contact-form-widget page-contact-form">
    <div class="form">
        <form name="contact-form">
            <span>İsim</span>
            <input class="contact-form-name" id="ContactForm1_contact-form-name" name="name" size="30" type="text"
                value="" />
            E-posta<span id="required">*</span>
            <input class="contact-form-email" id="ContactForm1_contact-form-email" name="email" size="30" type="text"
                value="" required="required" />
            Mesajınız<span id="required">*</span>
            <textarea class="contact-form-email-message" cols="25" id="ContactForm1_contact-form-email-message"
                name="email-message" rows="5" required="required"></textarea>
            <input class="contact-form-button contact-form-button-submit" id="ContactForm1_contact-form-submit"
                type="button" value="Gönder" />
            <div class="contact-form-error-message" id="ContactForm1_contact-form-error-message">
            </div>
            <div class="contact-form-success-message" id="ContactForm1_contact-form-success-message">
            </div>
        </form>
    </div>
</div>

Yapıyı bozmadan standartlara uygun ufak bir dokunuş.