how to change the color of your button in bootstrap code example

Example: how to change the color of a bootstrap button

.btn-default
 
{
 
background-color: #68889E;
 
color:#FFF;
 
border-color: #2F3E48;
 
}
 
.btn-default:hover, .btn-default:focus, .btn-default:active, .btn-default.active, .open .dropdown-toggle.btn-default {
 
 
 
background-color: #2F3E48;
 
color:#FFF;
 
border-color: #31347B;
 
}