Borders
Use Bootstrap borders plus theme border listed below:
.border .border-theme
.border .border-theme-inverse
.border .border-light
.border .border-dark
.border .border-secondary-900
.border .border-secondary-500
.border .border-tertiary-900
.border .border-tertiary-500
.border .border-theme-success
.border .border-theme-warning
.border .border-theme-danger
Border Gradient PS
Border Gradient PT
Border Gradient ST
Border Gradient Mesh 1
Border Gradient Mesh 2
Border Gradient Mesh 3