Dear @Ros_rgb
you need to give the button a link.
The CSS looks for a link:
.buttonstyle a {
padding: 15px 20px;
display: inline-block;
background-color: #e8e8e8;
border-radius: 3
}
The a means that it looks for a link.
Try to link the button to something and let us know if it worked.
All the best!
Marius