それぞれ背景色に応じた文字色が定義されます
1 2 3 4 5 | < span class = "bg-primary" >bg-primary</ span > < span class = "bg-success" >bg-success</ span > < span class = "bg-info" >bg-info</ span > < span class = "bg-warning" >bg-warning</ span > < span class = "bg-danger" >bg-danger</ span > |
bg-primary
bg-success
bg-info
bg-warning
bg-danger
1 2 3 4 5 | < p class = "bg-primary" >bg-primary</ p > < p class = "bg-success" >bg-success</ p > < p class = "bg-info" >bg-info</ p > < p class = "bg-warning" >bg-warning</ p > < p class = "bg-danger" >bg-danger</ p > |