Lightning Component:

<!--demo.cmp-->
<aura:component implements="force:lightningQuickAction">
    <!--style to incraee width-->
    <aura:html tag="style">
        .slds-modal__container{
        max-width: 80rem !important;
        width:80% !important;
        }
    </aura:html>
    
    <!--Component Start-->
    <div class="slds-m-around--xx-large">
        <div class="slds-text-heading_medium slds-align_absolute-center">
            Welcome to Biswajeet Samal's Blog
        </div>
    </div>
    <!--Component End-->
</aura:component>