Hi,Welcomeback!
JustDo Buttons Ui,
ButtonsYou can use classes which names are .btn .btn-primary .disabled .btn-outline-primary
.btn .btn-primary
.btn .btn-default
.btn .btn-success
.btn .btn-danger
.btn .btn-warning
.btn .btn-info
.btn .btn-light
.btn .btn-dark
.btn .btn-link
Buttons Rounded
.btn .btn-primary .btn-round
.btn .btn-default .btn-round
.btn .btn-success .btn-round
.btn .btn-danger .btn-round
.btn .btn-warning .btn-round
.btn .btn-info .btn-round
.btn .btn-light .btn-round
.btn .btn-dark .btn-round
Disabled State
.btn .btn-primary .disabled
.btn .btn-default .disabled
.btn .btn-success .disabled
.btn .btn-danger .disabled
.btn .btn-warning .disabled
.btn .btn-info .disabled
.btn .btn-light .disabled
.btn .btn-dark .disabled
.btn .btn-link .disabled
Outline buttons
.btn .btn-outline-primary
.btn .btn-outline-secondary
.btn .btn-outline-success
.btn .btn-outline-danger
.btn .btn-outline-warning
.btn .btn-outline-info
.btn .btn-outline-light
.btn .btn-outline-dark