To change design of Featured  status change CSS in this class:

Default property unit

.featured_div {
max-width: 85px;
float: left;
background-color: #f1bf7f;
color: #333333;
position: relative;
left: 0px;
font-size: 12px;
border-radius: 0px;
padding: 1px 18px;
line-height: 17px;
background-image: none!important;
margin-bottom: 4px;
}

To change design of Full info button change CSS in these classes:

.unit_details_x a, .unit_details_x {
font-size: 12px;
background-color: #f1bf7f;
color: #ffffff;
float: right;
padding: 4px 7px;
margin-top: 4px;
line-height: 12px;
}

.unit_details_x:hover {
color: #3c90be;
}

Help for where to add custom css: https://help.wpresidence.net/article/how-to-add-custom-css/