I'm trying to align and style a set of checkboxes with the rest of my form, but I don't have much experience styling forms. I'm struggling to reference the legend, labels, and input boxes separately. I've seen checkboxes structured with different mark-up, so I'm not sure if there's a better way to accomplish this.
HTML:
<div id="appraisals-form" class="contact-form">
    <form role="form" method="post" action="contact-form.php">
        <label for="name"><span>Name</span><input type="text" class="input-field" name="name" required data-errormessage-value-missing="Please enter your name." /></label>
        <label for="email"><span>Email</span><input type="email" class="input-field" name="email" required data-errormessage-value-missing="Please enter your email address." /></label>
        <label for="email"><span>Phone</span><input type="tel" class="input-field" name="phone" required data-errormessage-value-missing="Please enter your phone number." /></label>
        <label for="art-type" class="wrap"><span class="wrap-lg">Type of Artwork</span><span class="wrap-sm">(i.e. sculpture, painting...)</span><input class="input-field" type="text" name="name" required data-errormessage-value-missing="Please enter your item's type of artwork."></label>
        <label for="artist" class="wrap"><span class="wrap-lg">Artist Name</span><span class="wrap-sm">(if known)</span><input class="input-field" type="text" name="name" required data-errormessage-value-missing="Please enter your item's artist."></label>
        <label for="title" class="wrap"><span class="wrap-lg">Title of Piece</span><span class="wrap-sm">(if known)</span><input class="input-field" type="text" name="name" required data-errormessage-value-missing="Please enter your item's title."></label>
        <label for="measurements"><span>Measurements</span><input type="text" class="input-field" name="name" required data-errormessage-value-missing="Please enter your item's measurements." /></label>
        <label for="date" class="wrap"><span class="wrap-lg">Date / Age</span><span class="wrap-sm">(if known)</span><input class="input-field" type="text" name="name" required data-errormessage-value-missing="Please enter your item's date / age."></label>
        <label for="condition"><span>Condition</span><textarea name="message" class="textarea-field" required data-errormessage-value-missing="Please enter your item's condition."></textarea></label>
        <label for="doc" class="wrap"><span class="wrap-lg">Documentation</span><span class="wrap-sm">(certificates, receipts, previous appraisals, etc.)</span><textarea name="doc" class="textarea-field" required data-errormessage-value-missing="Please enter your item's documentation."></textarea></label>
        <label for="writing" class="wrap"><span class="wrap-lg">Writing / Labels</span><span class="wrap-sm">(text or any writing or labels on the art)</span><textarea name="doc" class="textarea-field" required data-errormessage-value-missing="Please enter your item's text / labels."></textarea></label>
        <label for="purchase-hist" class="wrap"><span class="wrap-lg">Purchase History</span><span class="wrap-sm">(date, cost, location, etc.)</span><textarea name="doc" class="textarea-field" required data-errormessage-value-missing="Please enter your item's purchase history."></textarea></label>
        <label for="additional" class="wrap"><span class="wrap-lg">Additional Details</span><span class="wrap-sm">(anything else you know)</span><textarea name="doc" class="textarea-field" required data-errormessage-value-missing="Please enter your item's additional details."></textarea></label>
        <fieldset>
            <legend>Type of Appraisal</legend>
            <input type="checkbox" name="app-type" value="Insurance" />Insurance
            <input type="checkbox" name="app-type" value="Donation" />Donation
            <input type="checkbox" name="app-type" value="General Estate Planning" />General Estate Planning
        </fieldset>
        <div class="centred-button"><input type="submit" value="" class="submit-button" /></div>                  
    </form>             
</div>
CSS:
.contact-form {
    margin: 0 auto;
    max-width: 600px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    font-family: 'LinotypeUniversW01-Thin_723604', Arial, sans-serif;
    font-size: 20px;
}
.contact-form label {
    display: block;
    margin: 0px 0px 15px 0px;
    text-transform: uppercase; /* New */
}
.contact-form label > span {
    padding-top: 8px;
}
.contact-form label > span, #recaptcha::before {
    width: 100px;
    text-align: right;
    float: left;
    padding-right: 20px;
    content: "";
}
.contact-form input, .contact-form textarea, .contact-form fieldset {
    margin-bottom: 15px;
    padding: 10px;
    border: none;
}
.contact-form input.input-field {
    width: 70%;
    height: 20px;
    font-size: 18px;
}
.contact-form .textarea-field {
    height: 250px;
    margin-bottom: 11px;
}
.contact-form .textarea-field, .g-recaptcha {
    width: 70%;
    font-size: 18px;
    display: inline-block;
}
.contact-form fieldset { /* New */
    font-size: 16px;
}
.contact-form legend { /* New */
    width: 150px;
    text-align: right;
    float: left;
    padding-right: 20px;
    content: "";
    text-transform: uppercase;
}
.contact-form fieldset input { /* New */
    margin-right: 10px;
    text-align: left;
}
.g-recaptcha {
    height: 78px !important;
}
#recaptcha {
    display: block;
    margin: 0px 0px 24px 0px;
}
textarea {
    resize: none;
}
textarea:focus, input:focus {
    outline: 0;
}
input.submit-button {
    background-image: url("../img/submit-button.jpg");
    width: 225px;
    height: 60px;
    border: none;
}
Fiddle: http://jsfiddle.net/trqgos4q/.
Any help would be really appreciated!

 
    