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/>
   <!--Start RelatedTopics Section-->
<div style="border:1px #ddd solid; padding:10px; background:#eee; margin:40px 0;">
            
            <p data-aura-rendered-by="435:0"><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;" data-aura-rendered-by="436:0"><strong data-aura-rendered-by="437:0"><span style="font-size:16px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span><a href="https://www.w3web.net/" target="_blank" rel="noopener noreferrer" style="text-decoration:none;" data-aura-rendered-by="440:0">An easy way to learn step-by-step online free Salesforce tutorial, To know more Click  <span style="color:#ff8000; font-size:18px;" data-aura-rendered-by="442:0">Here..</span></a></strong></p>
 
            <br/><br/>
            <p data-aura-rendered-by="435:0"><img src="https://www.w3web.net/wp-content/uploads/2021/07/tickMarkIcon.png" width="25" height="25" style="vertical-align:top; margin-right:10px;" data-aura-rendered-by="436:0"><strong data-aura-rendered-by="437:0"><span style="font-size:17px; font-style:italic; display:inline-block; margin-right:5px; color:rgb(255 128 0);">You May Also Like →</span> </strong></p>
            <div style="display:block; overflow:hidden;"> 
                <div style="width: 50%; float:left; display:inline-block">
                    <ul style="list-style-type: square; font-size: 16px; margin: 0 0 0 54px; padding: 0;"> 
                        <li><a href="https://www.w3web.net/lwc-get-set-lightning-checkbox-value/" target="_blank" rel="noopener noreferrer">How to get selected checkbox value in lwc</a></li>
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                        <li><a href="https://www.w3web.net/create-lightning-datatable-row-actions-in-lwc/" target="_blank" rel="noopener noreferrer">how to create lightning datatable row actions in lwc</a></li>
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            <div style="width: 50%; float:left; display:inline-block">
                    <ul style="list-style-type: square; font-size: 16px; margin: 0 0 0 54px; padding: 0;"> 
                        <li><a href="https://www.w3web.net/display-account-related-contacts-lwc/" target="_blank" rel="noopener noreferrer">display account related contacts based on account name in lwc</a></li>
                        <li><a href="https://www.w3web.net/create-lightning-datatable-row-actions-in-lwc/" target="_blank" rel="noopener noreferrer">how to insert a record of account Using apex class in LWC</a></li>
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                    </ul>
                </div>
               <div style="clear:both;"></div> 
               <br/>
                <div class="youtubeIcon">
                    <a href="https://www.youtube.com/channel/UCW62gTen2zniILj9xE6LmOg" target="_blank" rel="noopener noreferrer"><img src="https://www.w3web.net/wp-content/uploads/2021/11/youtubeIcon.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong>TechW3web:-</strong> To know more, Use this <span style="color: #ff8000; font-weight: bold;">Link</span> </a>
                </div>
    </div>
 
</div>
 
  <!--End RelatedTopics Section-->
    </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 data-aura-rendered-by="435:0"><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;" data-aura-rendered-by="436:0"><strong data-aura-rendered-by="437:0"><span style="font-size:16px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span><a href="https://www.w3web.net/" target="_blank" rel="noopener noreferrer" style="text-decoration:none;" data-aura-rendered-by="440:0">An easy way to learn step-by-step online free Salesforce tutorial, To know more Click <span style="color:#ff8000; font-size:18px;" data-aura-rendered-by="442:0">Here..</span></a></strong></p>

<li><a href="https://www.w3web.net/lwc-get-set-lightning-checkbox-value/" target="_blank" rel="noopener noreferrer">How to get selected checkbox value in lwc</a></li>

<li><a href="https://www.w3web.net/display-account-related-contacts-in-lwc/" target="_blank" rel="noopener noreferrer">how to display account related contacts based on AccountId in lwc</a></li>

<li><a href="https://www.w3web.net/create-lightning-datatable-row-actions-in-lwc/" target="_blank" rel="noopener noreferrer">how to create lightning datatable row actions in lwc</a></li>

<li><a href="https://www.w3web.net/if-and-else-condition-in-lwc/" target="_blank" rel="noopener noreferrer">how to use if and else condition in lwc</a></li>

<li><a href="https://www.w3web.net/get-selected-radio-button-value-and-checked-default-in-lwc/" target="_blank" rel="noopener noreferrer">how to display selected radio button value in lwc</a></li>

</ul>

</div>

<li><a href="https://www.w3web.net/display-account-related-contacts-lwc/" target="_blank" rel="noopener noreferrer">display account related contacts based on account name in lwc</a></li>

<li><a href="https://www.w3web.net/create-lightning-datatable-row-actions-in-lwc/" target="_blank" rel="noopener noreferrer">how to insert a record of account Using apex class in LWC</a></li>

<li><a href="https://www.w3web.net/fetch-picklist-values-dynamic-in-lwc/" target="_blank" rel="noopener noreferrer">how to get picklist values dynamically in lwc</a></li>

<li><a href="https://www.w3web.net/edit-save-and-remove-rows-dynamically-in-lightning-component/" target="_blank" rel="noopener noreferrer">how to edit/save row dynamically in lightning component</a></li>

<li><a href="https://www.w3web.net/update-parent-object-from-child/" target="_blank" rel="noopener noreferrer">update parent field from child using apex trigger</a></li>

</ul>

</div>

<br/>

<a href="https://www.youtube.com/channel/UCW62gTen2zniILj9xE6LmOg" target="_blank" rel="noopener noreferrer"><img src="https://www.w3web.net/wp-content/uploads/2021/11/youtubeIcon.png" width="25" height="25" style="vertical-align:top; margin-right:10px;"/> <strong>TechW3web:-</strong> To know more, Use this <span style="color: #ff8000; font-weight: bold;">Link</span> </a>

</div>

</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

Further post that would you like to learn in LWC

The Sitemap to Find all Published Post of The Tutorial w3web.net Click Here For More Information

FAQ (Frequently Asked Questions)

How do you install styling in LWC?

LWC doesn't reflect a component's custom public properties into their corresponding HTML attributes. To give identity to a child element for styling, use a class attribute or a data-* attribute.

How do you add custom CSS in lightning component?

You can add CSS to a lightning component bundle by clicking the STYLE button in the Developer Console sidebar. after click on the STYLE button on component bundle, new CSS file is create with . css ext.

How do I add SLDS to Aura component?

You can use extends='force:slds' in lightning application. So it will automatically apply slds to lightning components that are related to application.

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. [Read full bio] | | The Sitemap where you can find all published post on w3web.net

17 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

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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.
sandy

April 28, 2021 at 6:41 am

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Himal Ghale

June 9, 2021 at 6:56 am

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gstudiovect

June 11, 2021 at 2:29 pm

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Roshan maurya

June 13, 2021 at 1:10 pm

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June 18, 2021 at 12:12 pm

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July 7, 2021 at 10:00 am

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July 20, 2021 at 4:52 pm

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Fiona Xu

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September 30, 2021 at 10:27 am

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Files we used in this post example

lwcApplyCss.html [Lightning Web Component HTML]

lwcApplyCss.js [LWC JavaScript File]

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

Start Lightning Application

lwcApp.app [Component Application File]

How do you install styling in LWC?

How do you add custom CSS in lightning component?

How do I add SLDS to Aura component?

Related Topics | You May Also Like

Author of w3web.net

17 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”

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