Css Zero Showcase

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<form action="/slow_action" accept-charset="UTF-8" method="post"><input type="hidden" name="authenticity_token" value="hwASfO0I88v6n97NUa_ExYwlVcXX24nsGKSsjXcFgs04uEE2g5mn_ha-YU98yCIxZziA7qE1gn7mEF6C0dyP3Q" autocomplete="off" />
  <button name="button" type="submit" class="btn btn--busy"><span>Click and wait</span></button>
</form>
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<%= form_with url: main_app.slow_action_path do |form| %>
  <%= form.button tag.span("Click and wait"), class: "btn btn--busy" %>
<% end %>
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.btn {
  align-items: center;
  background-color: var(--btn-background, var(--color-surface));
  block-size: var(--btn-block-size, auto);
  border: 1px solid var(--btn-border-color, var(--color-border));
  border-radius: var(--btn-radius, var(--rounded-lg));
  box-shadow: var(--btn-box-shadow, var(--shadow-xs));
  color: var(--btn-color, var(--color-text));
  column-gap: var(--btn-column-gap, var(--size-1_5));
  cursor: var(--btn-cursor, default);
  display: inline-flex;
  font-size: var(--btn-font-size, var(--text-sm));
  font-weight: var(--btn-font-weight, var(--font-medium));
  inline-size: var(--btn-inline-size, auto);
  justify-content: var(--btn-justify-content, center);
  padding: var(--btn-padding, .25rem .625rem);
  position: relative;
  white-space: nowrap;
  .icon {
    --icon-size: var(--btn-icon-size, 1rem);
  }
  &:hover {
    background-color: var(--btn-hover-color, var(--color-border-light));
  }
  &:focus-visible {
    outline: var(--btn-outline-size, 2px) solid var(--color-selected-dark);
  }
  &:is(:disabled, [aria-disabled="true"]) {
    opacity: var(--opacity-50);
    pointer-events: none;
  }
}
/* Variants */
.btn--primary {
  --btn-background: var(--color-primary);
  --btn-border-color: transparent;
  --btn-color: var(--color-text-reversed);
  --btn-hover-color: rgb(from var(--color-primary) r g b / .9);
}
.btn--secondary {
  --btn-background: var(--color-secondary);
  --btn-border-color: transparent;
  --btn-hover-color: rgb(from var(--color-secondary) r g b / .8);
}
.btn--borderless {
  --btn-background: transparent;
  --btn-border-color: transparent;
  --btn-box-shadow: none;
}
.btn--negative {
  --btn-background: var(--color-surface-negative);
  --btn-border-color: transparent;
  --btn-color: var(--color-text-negative);
  --btn-hover-color: rgb(from var(--color-surface-negative) r g b / .9);
}
.btn--plain {
  --btn-background: transparent;
  --btn-border-color: transparent;
  --btn-box-shadow: none;
  --btn-hover-color: transparent;
  --btn-padding: 0;
}
.btn--icon {
  --btn-padding: var(--size-1_5);
}
/* Sizes */
.btn--xs {
  --btn-font-size: var(--text-xs);
  --btn-padding: var(--size-0_5) var(--size-2);
}
.btn--icon-xs {
  --btn-icon-size: var(--size-3_5);
  --btn-padding: var(--size-1);
}
.btn--sm {
  --btn-padding: var(--size-0_5) var(--size-2_5);
}
.btn--icon-sm {
  --btn-padding: var(--size-1);
}
.btn--lg {
  --btn-padding: var(--size-1_5) var(--size-3);
}
.btn--icon-lg {
  --btn-padding: var(--size-2);
}
/* Extras */
.btn--feedback {
  transition-duration: var(--time-150);
  transition-property: transform;
  transition-timing-function: var(--ease-out-3);
  &:active {
    transform: scale(0.97);
  }
}
[aria-busy] .btn--busy:disabled {
  > * {
    visibility: hidden;
  }
  &::after {
    animation: x-spin 1s linear infinite;
    background-color: currentColor;
    block-size: var(--size-4);
    content: "";
    inline-size: var(--size-4);
    mask-image: url("loading.svg");
    mask-size: cover;
    position: absolute;
  }
}
Java Script is not required or multiple files are needed, check the notes.

Turbo adds aria-busy to the form while the form request is in progress, check here.