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Bulma class: .button.is-loading

<a class="button is-loading">Loading</a>

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More in Bulma Button

button
button.is-text
button.is-white
button.is-black
button.is-light
button.is-dark
button.is-primary
button.is-link
button.is-info
button.is-success
button.is-warning
button.is-danger
button.is-small
button.is-normal
button.is-medium
button.is-large
button.is-fullwidth
button.is-static
button.is-rounded
buttons
buttons.has-addons
buttons.is-centered
buttons.is-right
is-hovered
is-outlined

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