Twitter-Bootstrap buttons are awesomely beautiful. Try them out by scrolling over them
If you are already loading your own custom CSS file after loading bootstrap.css (version 3) you can add these 2 CSS styles to your custom.css and they will override the bootstrap defaults for the default button style.
.btn-primary:hover, .btn-primary:focus, .btn-primary:active, .btn-primary.active, .open .dropdown-toggle.btn-primary {
background-color: #A6A8C1;
border-color: #31347B;
}
.btn
{
background-color: #9F418F;
border-color: #9F418F;
}