Lightning Card Using in Lightning Component

<aura:component >
    <lightning:card title="SalesforceCodes" footer="Email : [email protected]" iconName="standard:branch_merge">
        Hi this is shown the usage of Lightning Card. 
    </lightning:card>
    
    <lightning:card footer="Email : [email protected]" iconName="standard:branch_merge">
        <aura:set attribute="title" >
            Salesforce
            Codes
        </aura:set>
        Hi this is shown the usage of Lightning Card with aura:set
    </lightning:card>
    
    <div class="card">
        <lightning:card footer="Email : [email protected]" title="Account" iconName="standard:account"> 
            <aura:set attribute="actions" >
                <lightning:button label="save"/>
                <lightning:button label="cancel"/>
            </aura:set>
            <div class="inner">
                Account Name:<lightning:input type="text"/>
                Phone		:<lightning:input type="text"/>
                Industry	:<lightning:input type="text"/>
            </div>
        </lightning:card>
    </div>
</aura:component>

.THIS.card{
    margin-left:475px;
    margin-right:475px;
    border:2px solid cyan;
    padding:20px;
}
.THIS .inner{
    padding:20px;
}

<aura:application extends="force:slds" >
    <c:Basic3/>
</aura:application>