Downloading the CSS and re-uploading it as a static resource is unnecessary. You can use the SLDS stylesheets by [adding the `<apex:slds />` tag to your Visualforce page](https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_styling_slds.htm). [This is documented on the SLDS site under Visualforce](https://www.lightningdesignsystem.com/platforms/visualforce/), the download is offered if you want to use the CSS _outside_ of Salesforce. You can also scope where you want the SLDS styles to be applied. ```html <apex:page standardController="Account" applyBodyTag="false"> <apex:slds /> <!-- any Visualforce component should be outside SLDS scoping element --> <apex:outputField value="{!Account.OwnerId}" /> <div class="slds-scope"> <!-- SLDS markup here --> </div> </apex:page> ``` **Additionally,** make sure you're using the appropriate markup for the SLDS class names. Many of the classes that use double hyphens (`--`) have been deprecated. # EDIT # This example works in a Community Visualforce component. ```html <apex:page showHeader="false" standardStylesheets="false" sidebar="false" applyHtmlTag="false" applyBodyTag="false" docType="html-5.0"> <html> <body> <apex:slds /> <apex:form id="form" styleClass="slds-scope"> <div class="slds-modal__header"> <h2 class="slds-text-heading_medium">SLDS On Visualforce page</h2> </div> <div class="slds-modal__content slds-p-around_medium"> <apex:commandLink value="Cancel" styleClass="slds-button slds-button_brand"></apex:commandLink> </div> </apex:form> </body> </html> </apex:page> ```