Better Alert Colors

If you're using BS4 sass, you can simply copy the code between the "pre" tags (below) into your variables file.

This is an error alert

This is a warning alert

This is an info alert

This is a success alert

The variables:

          //This would go in your bootstrap variables file, overwriting the BS variables
          $state-success-text:             #fff !default;
          $state-success-bg:               #68C934 !default;
          $state-success-border:           darken($state-success-bg, 10%) !default;

          $state-info-text:                #fff !default;
          $state-info-bg:                  #45ABCD !default;
          $state-info-border:              darken($state-info-bg, 10%) !default;

          $state-warning-text:             #fff !default;
          $state-warning-bg:               #ff9800 !default;
          $state-warning-border:           darken($state-warning-bg, 10%) !default;

          $state-danger-text:              #fff !default; 
          $state-danger-bg:                #9E170E !default;
          $state-danger-border:            darken($state-danger-bg, 10%) !default;