slds-spinner

https://www.lightningdesignsystem.com/components/spinners/

<c:Spinner size="medium" variant="base" alternativeText="Loading" backgroundColor="rgba(255,255,255,0.75)">
    <p class="slds-m-bottom_medium">I can contain text</p>
    <lightning:button label="And buttons" variant="neutral" />
</c:Spinner>

Attributes

size [x-small|small|medium|large] default is 'medium'

variant [base|brand] default is 'base'

alternativeText String default is 'Loading'

backgroundColor String (CSS color value) default is 'rgba(255,255,255,0.75)'