In bootstrap.css, you can change the color of a button in a class btn-primaryin different states. Check out the following code:
.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active,
.btn-primary.active {
color: #ffffff;
background-color: #3276b1;
border-color: #285e8e;
}
So. You can change the color, background color, etc. as you wish.
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