portainer/app/assets/css/button.css

.btn {
  border-radius: 5px;
  display: inline-flex;
  justify-content: space-around;
  align-items: center;
  gap: 5px;
}

.btn-group {
  display: inline-flex;
}

.btn.active {
  box-shadow: none;
}

.btn-primary {
  background-color: var(--ui-blue-8);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active .active {
  background-color: var(--ui-blue-9);
}

.btn-primary:active,
.btn-primary.active,
.open > .dropdown-toggle.btn-primary {
  background-color: var(--ui-blue-9);
}

.nav-pills > li.active > a,
.nav-pills > li.active > a:hover,
.nav-pills > li.active > a:focus {
  background-color: var(--ui-blue-8);
}

.btn-danger {
  background-color: var(--ui-error-8);
}

.btn-success {
  background-color: var(--ui-success-7);
}

.btn-dangerlight {
  border: 1px solid var(--text-button-dangerlight-color);
  color: var(--ui-error-9);
}

.btn-dangerlight:hover {
  color: var(--ui-error-9) !important;
  background-color: var(--ui-error-2) !important;
}

.btn-light {
  background-color: var(--bg-button-group-color);
  border: 1px solid var(--border-button-group);
  color: var(--text-button-group-color);
}

.btn-light:hover {
  background-color: var(--ui-gray-2) !important;
}

.btn-light:active,
.btn-light.active,
.open > .dropdown-toggle.btn-light {
  background-color: var(--ui-gray-3);
}

/* Button Secondary */
.btn-secondary {
  background-color: var(--ui-blue-2) !important;
  border: 1px solid var(--ui-blue-8) !important;
  color: var(--ui-blue-9) !important;
}

.btn-secondary:hover,
.btn-secondary:focus,
.btn-secondary:active .active {
  background-color: var(--ui-blue-3) !important;
  color: var(--ui-blue-9) !important;
}

.btn-secondary:disabled {
  background-color: var(--ui-blue-1);
  border: 1px solid var(--ui-blue-1);
  color: var(--ui-blue-5);
}

form a,
.form-group a,
.hyperlink {
  color: var(--ui-blue-8);
}

form a:hover,
.form-group a:hover,
.hyperlink:hover {
  text-decoration: underline;
  color: var(--ui-blue-9);
}

.btn-group > .btn:first-child:not(:last-child):not(.dropdown-toggle) {
  background: var(--bg-button-group-color) !important;
  color: var(--text-button-group-color);
}