how to make buttons blend with page background in CSS code example

Example: how to configure buttons in css

div.wpforms-container-full .wpforms-form button[type=submit] {
 
color: #0099CC; /* Text color */
 
background-color: transparent; /* Remove background color */
 
border: 2px solid #0099CC; /* Border thickness, line style, and color */
 
border-radius: 5px; /* Adds curve to border corners */
 
text-transform: uppercase; /* Make letters uppercase */
 
}