src/assets/styles/_toast.scss

.b-toaster {
  top: 75px!important; // make sure toasts do not hide top header
}

.toast {
  padding: $spacer/2 $spacer/2 $spacer/2 $spacer;
  border-width: 0 0 0 5px;
  .close {
    font-weight: 300;
    opacity: 1;
  }
}

.toast-header {
  background-color: inherit!important; //override specificity
  border: none;
  color: $dark!important; //override specificity
  padding-bottom: 0;
}

.toast-body {
  color: $dark;
  padding-top: 0;
}

.b-toast-success .toast {
  border-left-color: $success!important;
}

.b-toast-danger .toast {
  border-left-color: $danger!important;
}

.b-toast-warning .toast {
  border-left-color: $warning!important;
}