Labels inside form fields and checkbox layout

Site URL: https://khaki-elk-54rm.squarespace.com/contact

Hello, I would like to have labels for my contact form inside of the fields like the image below. And also the checkboxes layout out beside each other instead of stacked like the other image below. Password to site is Brad. Any help is appreciated! Thank you! I am changing domains so the domain may be bradmurphyforcongress.com. 

16 hours ago, tuanphan said:

With 3 checkboxes, add this to Design > Custom CSS

/* Form checkbox */
@media screen and (min-width:992px) {
div#block-yui_3_17_2_1_1638811742931_3679 .option {
    width: 33.3333% !important;
    float: left !important;
}
}

 

Thank you!!