bootstrap 4 black color class code example
Example 1: bootstrap text color
.text-primary
.text-secondary
.text-success
.text-danger
.text-warning
.text-info
.text-light
.text-dark
.text-muted
.text-white
Example 2: bootstrap color
primary - #007bff
secondary - #6c757d
success - #28a745
danger - #dc3545
warning - #ffc107
info - #17a2b8
light - #f8f9fa
dark - #343a40
muted - #6c757d
white - #ffffff
Example 3: bootstrap 4 text color
Text with primary color
Text with secondary color
Text with success color
Text with danger color
Text with warning color
Text with info color
Text with light color
Text with dark color
Text with muted color
Text with white color
Example 4: bootstrap background
.bg-primary
.bg-secondary
.bg-success
.bg-danger
.bg-warning
.bg-info
.bg-light
.bg-dark
.bg-white