Have you ever wanted your buttons to look like Bootstrap's, but didn't want all of the styling that comes with having a full sized bootstrap.css file?

Now you can! I went though and stripped off everything you need to have Bootstrap buttons, just add the following to the bottom of your CSS!

Supports all button type (primary, danger, etc) and sizes (large, default, small, extra small)!

.btn {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: normal;
  line-height: 1.42857143;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  background-image: none;
  border: 1px solid transparent;
  border-radius: 4px;
}
.btn:focus,
.btn:active:focus,
.btn.active:focus {
  outline: thin dotted;
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}
.btn:hover,
.btn:focus {
  color: #333;
  text-decoration: none;
}
.btn:active,
.btn.active {
  background-image: none;
  outline: 0;
  -webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125);
          box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125);
}
.btn.disabled,
.btn[disabled],
fieldset[disabled] .btn {  
  pointer-events: none;
  cursor: not-allowed;
  filter: alpha(opacity=65);
  -webkit-box-shadow: none;
          box-shadow: none;
  opacity: .65;
}
.btn-default {
  color: #333;
  background-color: #fff;
  border-color: #ccc;
}
.btn-default:hover,
.btn-default:focus,
.btn-default:active,
.btn-default.active,
.open .dropdown-toggle.btn-default {
  color: #333;
  background-color: #ebebeb;
  border-color: #adadad;
}
.btn-default:active,
.btn-default.active,
.open .dropdown-toggle.btn-default {
  background-image: none;
}
.btn-default.disabled,
.btn-default[disabled],
fieldset[disabled] .btn-default,  
.btn-default.disabled:hover,
.btn-default[disabled]:hover,
fieldset[disabled] .btn-default:hover,  
.btn-default.disabled:focus,
.btn-default[disabled]:focus,
fieldset[disabled] .btn-default:focus,  
.btn-default.disabled:active,
.btn-default[disabled]:active,
fieldset[disabled] .btn-default:active,  
.btn-default.disabled.active,
.btn-default[disabled].active,
fieldset[disabled] .btn-default.active {  
  background-color: #fff;
  border-color: #ccc;
}
.btn-default .badge {
  color: #fff;
  background-color: #333;
}
.btn-primary {
  color: #fff;
  background-color: #428bca;
  border-color: #357ebd;
}
.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active,
.btn-primary.active,
.open .dropdown-toggle.btn-primary {
  color: #fff;
  background-color: #3276b1;
  border-color: #285e8e;
}
.btn-primary:active,
.btn-primary.active,
.open .dropdown-toggle.btn-primary {
  background-image: none;
}
.btn-primary.disabled,
.btn-primary[disabled],
fieldset[disabled] .btn-primary,  
.btn-primary.disabled:hover,
.btn-primary[disabled]:hover,
fieldset[disabled] .btn-primary:hover,  
.btn-primary.disabled:focus,
.btn-primary[disabled]:focus,
fieldset[disabled] .btn-primary:focus,  
.btn-primary.disabled:active,
.btn-primary[disabled]:active,
fieldset[disabled] .btn-primary:active,  
.btn-primary.disabled.active,
.btn-primary[disabled].active,
fieldset[disabled] .btn-primary.active {  
  background-color: #428bca;
  border-color: #357ebd;
}
.btn-primary .badge {
  color: #428bca;
  background-color: #fff;
}
.btn-success {
  color: #fff;
  background-color: #5cb85c;
  border-color: #4cae4c;
}
.btn-success:hover,
.btn-success:focus,
.btn-success:active,
.btn-success.active,
.open .dropdown-toggle.btn-success {
  color: #fff;
  background-color: #47a447;
  border-color: #398439;
}
.btn-success:active,
.btn-success.active,
.open .dropdown-toggle.btn-success {
  background-image: none;
}
.btn-success.disabled,
.btn-success[disabled],
fieldset[disabled] .btn-success,  
.btn-success.disabled:hover,
.btn-success[disabled]:hover,
fieldset[disabled] .btn-success:hover,  
.btn-success.disabled:focus,
.btn-success[disabled]:focus,
fieldset[disabled] .btn-success:focus,  
.btn-success.disabled:active,
.btn-success[disabled]:active,
fieldset[disabled] .btn-success:active,  
.btn-success.disabled.active,
.btn-success[disabled].active,
fieldset[disabled] .btn-success.active {  
  background-color: #5cb85c;
  border-color: #4cae4c;
}
.btn-success .badge {
  color: #5cb85c;
  background-color: #fff;
}
.btn-info {
  color: #fff;
  background-color: #5bc0de;
  border-color: #46b8da;
}
.btn-info:hover,
.btn-info:focus,
.btn-info:active,
.btn-info.active,
.open .dropdown-toggle.btn-info {
  color: #fff;
  background-color: #39b3d7;
  border-color: #269abc;
}
.btn-info:active,
.btn-info.active,
.open .dropdown-toggle.btn-info {
  background-image: none;
}
.btn-info.disabled,
.btn-info[disabled],
fieldset[disabled] .btn-info,  
.btn-info.disabled:hover,
.btn-info[disabled]:hover,
fieldset[disabled] .btn-info:hover,  
.btn-info.disabled:focus,
.btn-info[disabled]:focus,
fieldset[disabled] .btn-info:focus,  
.btn-info.disabled:active,
.btn-info[disabled]:active,
fieldset[disabled] .btn-info:active,  
.btn-info.disabled.active,
.btn-info[disabled].active,
fieldset[disabled] .btn-info.active {  
  background-color: #5bc0de;
  border-color: #46b8da;
}
.btn-info .badge {
  color: #5bc0de;
  background-color: #fff;
}
.btn-warning {
  color: #fff;
  background-color: #f0ad4e;
  border-color: #eea236;
}
.btn-warning:hover,
.btn-warning:focus,
.btn-warning:active,
.btn-warning.active,
.open .dropdown-toggle.btn-warning {
  color: #fff;
  background-color: #ed9c28;
  border-color: #d58512;
}
.btn-warning:active,
.btn-warning.active,
.open .dropdown-toggle.btn-warning {
  background-image: none;
}
.btn-warning.disabled,
.btn-warning[disabled],
fieldset[disabled] .btn-warning,  
.btn-warning.disabled:hover,
.btn-warning[disabled]:hover,
fieldset[disabled] .btn-warning:hover,  
.btn-warning.disabled:focus,
.btn-warning[disabled]:focus,
fieldset[disabled] .btn-warning:focus,  
.btn-warning.disabled:active,
.btn-warning[disabled]:active,
fieldset[disabled] .btn-warning:active,  
.btn-warning.disabled.active,
.btn-warning[disabled].active,
fieldset[disabled] .btn-warning.active {  
  background-color: #f0ad4e;
  border-color: #eea236;
}
.btn-warning .badge {
  color: #f0ad4e;
  background-color: #fff;
}
.btn-danger {
  color: #fff;
  background-color: #d9534f;
  border-color: #d43f3a;
}
.btn-danger:hover,
.btn-danger:focus,
.btn-danger:active,
.btn-danger.active,
.open .dropdown-toggle.btn-danger {
  color: #fff;
  background-color: #d2322d;
  border-color: #ac2925;
}
.btn-danger:active,
.btn-danger.active,
.open .dropdown-toggle.btn-danger {
  background-image: none;
}
.btn-danger.disabled,
.btn-danger[disabled],
fieldset[disabled] .btn-danger,  
.btn-danger.disabled:hover,
.btn-danger[disabled]:hover,
fieldset[disabled] .btn-danger:hover,  
.btn-danger.disabled:focus,
.btn-danger[disabled]:focus,
fieldset[disabled] .btn-danger:focus,  
.btn-danger.disabled:active,
.btn-danger[disabled]:active,
fieldset[disabled] .btn-danger:active,  
.btn-danger.disabled.active,
.btn-danger[disabled].active,
fieldset[disabled] .btn-danger.active {  
  background-color: #d9534f;
  border-color: #d43f3a;
}
.btn-danger .badge {
  color: #d9534f;
  background-color: #fff;
}
.btn-link {
  font-weight: normal;
  color: #428bca;
  cursor: pointer;
  border-radius: 0;
}
.btn-link,
.btn-link:active,
.btn-link[disabled],
fieldset[disabled] .btn-link {  
  background-color: transparent;
  -webkit-box-shadow: none;
          box-shadow: none;
}
.btn-link,
.btn-link:hover,
.btn-link:focus,
.btn-link:active {
  border-color: transparent;
}
.btn-link:hover,
.btn-link:focus {
  color: #2a6496;
  text-decoration: underline;
  background-color: transparent;
}
.btn-link[disabled]:hover,
fieldset[disabled] .btn-link:hover,  
.btn-link[disabled]:focus,
fieldset[disabled] .btn-link:focus {  
  color: #999;
  text-decoration: none;
}
.btn-lg,
.btn-group-lg > .btn {
  padding: 10px 16px;
  font-size: 18px;
  line-height: 1.33;
  border-radius: 6px;
}
.btn-sm,
.btn-group-sm > .btn {
  padding: 5px 10px;
  font-size: 12px;
  line-height: 1.5;
  border-radius: 3px;
}
.btn-xs,
.btn-group-xs > .btn {
  padding: 1px 5px;
  font-size: 12px;
  line-height: 1.5;
  border-radius: 3px;
}
.btn-block {
  display: block;
  width: 100%;
  padding-right: 0;
  padding-left: 0;
}
.btn-block + .btn-block {
  margin-top: 5px;
}
input[type="submit"].btn-block,  
input[type="reset"].btn-block,  
input[type="button"].btn-block {  
  width: 100%;
}