btn-danger

bootstrap4.css

bootstrap4.css
.btn-danger {
  color: #fff;
  background-color: #dc3545;
  border-color: #dc3545;
}
bootstrap4.css
.btn-danger:hover {
  color: #fff;
  background-color: #c82333;
  border-color: #bd2130;
}
bootstrap4.css
.btn-danger:focus,
.btn-danger.focus {
  box-shadow: 0 0 0 0.2rem rgba(225, 83, 97, 0.5);
}
bootstrap4.css
.btn-danger.disabled,
.btn-danger:disabled {
  color: #fff;
  background-color: #dc3545;
  border-color: #dc3545;
}
bootstrap4.css
.btn-danger:not(:disabled):not(.disabled):active,
.btn-danger:not(:disabled):not(.disabled).active,
.show > .btn-danger.dropdown-toggle {
  color: #fff;
  background-color: #bd2130;
  border-color: #b21f2d;
}
bootstrap4.css
.btn-danger:not(:disabled):not(.disabled):active:focus,
.btn-danger:not(:disabled):not(.disabled).active:focus,
.show > .btn-danger.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(225, 83, 97, 0.5);
}

html Sample

ボタンの色:btn-*


  <button type="button" class="btn btn-primary">btn-primary</button>
  <button type="button" class="btn btn-secondary">btn-secondary</button>
  <button type="button" class="btn btn-success">btn-success</button>
  <button type="button" class="btn btn-danger">btn-danger</button>
  <button type="button" class="btn btn-warning">btn-warning</button>
  <button type="button" class="btn btn-info">btn-info</button>
  <button type="button" class="btn btn-light">btn-light</button>
  <button type="button" class="btn btn-dark">btn-dark</button>
  <button type="button" class="btn btn-link">btn-link</button>