This is the css for default button and hover color to apply and edit.
.comment-form #submit, .wpresidence_button { text-shadow: none; margin-bottom: 15px; border-radius: 0; text-transform: capitalize; padding: 8px 34px; border: 1px solid; line-height: 2; border-color: #2470af; color: #fff; background-color: #2470af!important; background-image: -webkit-gradient(linear,left top,right top,color-stop(50%,transparent),color-stop(50%,#2470af)); background-image: linear-gradient(to right,transparent 500%,#2470af 50%); background-size: 200% 100%; background-position: right bottom; display: inline-block; font-size: 15px; font-weight: 700; text-decoration: none; } .comment-form #submit:hover, .wpresidence_button:hover { text-decoration: none; background-color: #f1bf7f!important; background-position: left bottom; color: #fff; border-color: #f1bf7f!important; transition: all 300ms ease; webkit-transition: all 300ms ease; -o-transition: all 300ms ease; cursor: pointer; }
Please copy in custom css or child theme (where you make custom changes) and replace the color codes
OR try this css
.comment-form #submit:hover, .shortcode_contact_form.sh_form_align_center #btn-cont-submit_sh:hover, .single-content input[type="submit"]:hover, .agent_contanct_form input[type="submit"]:hover, #agent_submit:hover, .wpresidence_button:hover { border-color: #195045!important; background-color: #c7c3c3!important; color: white; border:1px solid #c7c3c3!important; }