opacity-<number>
opacity: calc(<number> * 0.01);
opacity-4
opacity: calc(4 * 0.01);
opacity-[<value>]
opacity: <value>;
opacity-[1.0]
opacity: 1.0;
opacity-(<custom-property>)
opacity: var(<custom-property>);
opacity-(--my-value)
opacity: var(--my-value);
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