Lightning Component:

<aura:component implements="force:lightningQuickActionWithoutHeader,flexipage:availableForRecordHome,force:hasRecordId">
    
    <!--Custom Styles for Modal Header and Footer-->  
    <aura:html tag="style">
        .cuf-content {
        padding: 0 0rem !important;
        }
        .slds-p-around--medium {
        padding: 0rem !important;
        }       
        .slds-modal__content{
        overflow-y:hidden !important;
        height:unset !important;
        max-height:unset !important;
        }
    </aura:html>
    
    <!--Modal Header-->   
    <div class="modal-header slds-modal__header slds-size_1-of-1">
        <h4 class="title slds-text-heading--medium">Biswajeet Samal's Blog</h4>
    </div>
    <!--End Modal Header-->   
    
    <!--Modal Body-->    
    <div class="slds-modal__content slds-p-around--x-small slds-align_absolute-center slds-size_1-of-1 slds-is-relative">
        <form class="slds-form--stacked">
            Welcome to Biswajeet Samal's Blog
        </form> 
    </div>
    <!--End of Modal Body-->  
    
    <!--Modal Footer-->
    <div class="modal-footer slds-modal__footer slds-size_1-of-1">
        <lightning:button variant="Brand" class="slds-button" label="Submit" onclick="{!c.handleSubmit}"/>
        <lightning:button variant="Neutral" class="slds-button" label="Cancel" onclick="{!c.handleClose}"/>
    </div>
    <!--End of Modal Footer-->
</aura:component>

JS Controller:

({
    handleSubmit : function(component, event, helper) {
        
    },
    
    handleClose : function(component, event, helper) {
        $A.get("e.force:closeQuickAction").fire() 
    }
})

Output: