Salesforce Lightning import file

<div class ="container slds-is-relative slds-m-top_medium">
	<div class="slds-box slds-theme_default">
		<div class="slds-grid slds-gutters slds-wrap">
			<div class="slds-col slds-align_absolute-center">
				<lightning:input aura:id="file" 
								 type="file" 
								 label="" 
								 name="file" 
								 multiple="false" 
								 accept=".csv" 
								 onchange="{!c.upload}"/>
			</div>
		</div>
	</div>
</div>