Hi,
I’ve tried yet what you said but clicking to expand any sub-menu after having selected “coustom colors” make everything disappear (another little bug maybe), I see just the “footer” of the plugin page (Made with <3 ecc…)
Anyway now I’ve solved using custoum css like:
button.forminator-button:enabled {
background: #17a8e3;
cursor: pointer;
display: block;
margin: 20px 0;
border: 0;
text-align: center;
text-transform: none;
padding: 10px;
border-radius: 2px;
line-height: 20px;
transition: .3s ease;
}