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-linkButtons 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-roundDisabled 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 .disabledOutline 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