:root {
  --bs-body-bg: pink;
  --bs-border-color: red;
  --bs-body-color: red;
}

body {
  background-color: pink;
  color: red;
}

.form-select {
  --bs-form-select-bg-img: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23ff0000' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
}

.form-switch .form-check-input {
  --bs-form-switch-bg: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23f00'/%3e%3c/svg%3e");
}