CSS for changing Caldera Forms buttons (including submit button) color, width or centering the button. https://calderawp.com/doc/button/

caldera-button.css

/** Center the button (inside it's column) **/
.caldera-grid .btn {
    display: block !important;
    margin-left: auto;
    margin-right: auto;
}

/** Make button the full width of the column **/
.caldera-grid .btn {
    width:100%
}

/** Change Background color and text color **/
.caldera-grid .btn {
    background-color:blue;
    color:white;
}

/** Change Background color and text color on hover **/
.caldera-grid .btn:hover {
    background-color:white;
    color:black;
}