body:not(.js-enabled) .btn-optional-field-toggle {
    display:none;
}

.btn-optional-field-toggle {
    background-image:none;
    background:#ccc !important;
    border:0 !important;
    color:#000 !important;
}

body.js-enabled:not(.hide-optional-fields) #show-optional,
body.js-enabled.hide-optional-fields #hide-optional,
body.js-enabled.hide-optional-fields .custom-form-field.optional {
    display: none;
}

body.js-enabled:not(.hide-optional-fields) .custom-form-field.optional {
    display: block !important;
}