How to add custom style css and change the text color & text size through JavaScript in lightning web component - LWC

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Hey guys, today in this post we are going to learn about How to add custom style css and change the text color & text size through JavaScript in lightning web component – LWC.

Files we used in this post example

lwcApplyCss.html	Lightning Web Component HTML	Template HTML file for used to write HTML element for user interface.
lwcApplyCss.js	Lightning Web Component JavaScript	It is holding onclick functionality for add custom style CSS to change the text color and text size.
lwcApplyCss.js-meta.xml	XML Meta File	It is used for where this lightning web component you want to exposed.
lwcApp.app	Lightning Application File	It is used for call the component and preview on browser..

Don’t forget to check out:- Adding a Custom Style CSS for Specific Role & Profile in Salesforce Click Here For More Information

Live Demo

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Step 1:- Create Lightning Web Component : lwcApplyCss.html

SFDX:Lightning Web Component >> New >> lwcApplyCss.html

lwcApplyCss.html [Lightning Web Component HTML]

  <template>
    <lightning-card title="Apply  Custom Style CSS in LWc through Javascript" custom-icon="custom:icon15">
        <div class="containerOver slds-p-around--medium slds-m-horizontal--medium" >
            <h1>Easy to learn Step-by-Step online tutorial from www.w3web.net</h1>
            <p class="listItem">Hi welcome to online tutorial www.w3web.net</p>
            <p class="listItem">w3web.net is the place where you can learn step-by-step about Blog, WordPress, Salesforce Lightning Component, Lightning Web Component (LWC), Visualforce, Technical of Computer Application, Salesforce Plugin, JavaScript, Jquery, CSS, Computer & Accessories, Software Configuration, Customization, Development and much more…</p></br></br>
            <div class="slds-text-align--center"><lightning-button label="Change Styling CSS" class="cssStyleBtn" variant="brand" onclick={customStyleChange}></lightning-button></div>
            </div>

<br/><br/>
    <p><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong> <span style="font-size:15px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span> <a href="https://www.w3web.net/" target="_blank" style="text-decoration:none;" rel="noopener noreferrer">An easy way to learn step-by-step online free tutorial, To know more Click  <span style="color:#ff8000; font-size:18px;">Here..</span></a></strong></p>
    </lightning-card>
</template>

<lightning-card title="Apply Custom Style CSS in LWc through Javascript" custom-icon="custom:icon15">

<h1>Easy to learn Step-by-Step online tutorial from www.w3web.net</h1>

<p class="listItem">Hi welcome to online tutorial www.w3web.net</p>

<p class="listItem">w3web.net is the place where you can learn step-by-step about Blog, WordPress, Salesforce Lightning Component, Lightning Web Component (LWC), Visualforce, Technical of Computer Application, Salesforce Plugin, JavaScript, Jquery, CSS, Computer & Accessories, Software Configuration, Customization, Development and much more…</p></br></br>

</div>

<p><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong> <span style="font-size:15px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span> <a href="https://www.w3web.net/" target="_blank" style="text-decoration:none;" rel="noopener noreferrer">An easy way to learn step-by-step online free tutorial, To know more Click <span style="color:#ff8000; font-size:18px;">Here..</span></a></strong></p>

</lightning-card>

</template>

Step 2:- Create Lightning Web Component : lwcApplyCss.js

SFDX:Lightning Web Component >> New >> lwcApplyCss.js

lwcApplyCss.js [LWC JavaScript File]

  import { LightningElement } from 'lwc';

export default class LwcApplyCss extends LightningElement {

    renderedCallback(){
		this.template.querySelector("h1").style.color="blue";
        this.template.querySelector("h1").style.textAlign="center";
        this.template.querySelector("h1").style.fontSize="16px";
        this.template.querySelector(".containerOver").style.boxShadow="0px 0px 5px #0007ea";
                this.template.querySelectorAll(".listItem").forEach(item=>{
                Object.assign(item.style, {color:'green',textAlign:'center',fontSize:'15px'});
        }); 
   }    


   customStyleChange(event){ 
    this.template.querySelector("h1").style.fontSize="22px";
    this.template.querySelector("h1").innerHTML="Easy to learn LWC tutorial from w3web.net";    
    this.template.querySelector(".containerOver").style.boxShadow="0px 0px 5px #ff0000"; 
      this.template.querySelectorAll(".listItem").forEach(item=>{
            Object.assign(item.style, {color:'red',textAlign:'center',fontSize:'18px'});
     });
   }
 

}

import { LightningElement } from 'lwc';

export default class LwcApplyCss extends LightningElement {

renderedCallback(){

this.template.querySelector("h1").style.color="blue";

this.template.querySelector("h1").style.textAlign="center";

this.template.querySelector("h1").style.fontSize="16px";

this.template.querySelector(".containerOver").style.boxShadow="0px 0px 5px #0007ea";

this.template.querySelectorAll(".listItem").forEach(item=>{

Object.assign(item.style, {color:'green',textAlign:'center',fontSize:'15px'});

});

}

customStyleChange(event){

this.template.querySelector("h1").style.fontSize="22px";

this.template.querySelector("h1").innerHTML="Easy to learn LWC tutorial from w3web.net";

this.template.querySelector(".containerOver").style.boxShadow="0px 0px 5px #ff0000";

this.template.querySelectorAll(".listItem").forEach(item=>{

Object.assign(item.style, {color:'red',textAlign:'center',fontSize:'18px'});

});

}

Step 3:- Create Lightning Web Component : lwcApplyCss.js-meta.xml

SFDX:Lightning Web Component >> New >> lwcApplyCss.js-meta.xml

lwcApplyCss.js-meta.xml [LWC Meta Data XML]

  <?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>45.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__HomePage</target>
        <target>lightning__Tab</target>
      </targets>
</LightningComponentBundle>

<?xml version="1.0" encoding="UTF-8"?>

<target>lightning__AppPage</target>

<target>lightning__RecordPage</target>

<target>lightning__HomePage</target>

<target>lightning__Tab</target>

</targets>

</LightningComponentBundle>

Start Lightning Application

Step 4:- Create Lightning Application : lwcApp.app

From Developer Console >> File >> New >> Lightning Application

lwcApp.app [Component Application File]

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

<aura:application extends="force:slds">

<c:lwcApplyCss/>

</aura:application>

TechW3web:- To know more, Use this Link

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Author of w3web.net

Hi, This is Vijay behind the admin and founder of w3web.net. I am a senior software developer and working in MNC company from more than 8 years. I am great fan of technology, configuration, customization & development. Apart of this, I love to write about Blogging in spare time, Working on Mobile & Web application development, Salesforce lightning, Salesforce LWC and Salesforce Integration development in full time.

15 thoughts on “How to add custom style css and change the text color & text size through JavaScript in lightning web component – LWC | how to add custom style css in lwc”

Nawaz Rizvi

December 21, 2020 at 5:02 pm

Thanks for this custom style css blog. I am happy to read this blog. I was helpful for me for boosting my knowledge.
Online WebTech

December 25, 2020 at 4:29 am

Thanks for the best knowledge of custom style of CSS. Does good hosting matters on our websites.
DudeTechPro

December 25, 2020 at 4:44 am

Thanks for the technical information regarding CSS. I want to get more infortaion.
Ravi Mishra

December 26, 2020 at 6:23 am

I like your blog
Ravi Mishra

December 26, 2020 at 6:24 am

I like your blog
Praveen Patil

January 8, 2021 at 1:57 pm

Excellent blog. Found very useful.
Masud Ali

April 6, 2021 at 5:03 pm

Excellent blog with huge information..Thank you
Noor Wali Baz

April 10, 2021 at 10:14 pm

it is a very good blog about css and font size. also explain a free plugin for wordpress user to change the font in wp.
Himal Ghale

June 9, 2021 at 6:56 am

great. thank you for sharing the CSS info, I learned more from this article.
gstudiovect

June 11, 2021 at 2:29 pm

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June 13, 2021 at 1:10 pm

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