Using SLDS styles in salesforce aura component

Hi Kumar,

If you have added your static resource named as 'SLDS' than you can use this in your component like:

<ltng:require styles="{!$Resource.SLDS +'/assets/styles/salesforce-lightning-design-system.css'}"/>

Thanks

You can use extends="force:slds" in lightning application. So it will automatically apply slds to lightning components that are related to application.

Example:

<aura:application extends="force:slds">
<!--component reference>
</aura:application>