1. Install barryvdh/laravel-dompdf Package In Your Application
composer require barryvdh/laravel-dompdf
2. Add Service Provider And Aliase, After package installation, we will add service provider and aliase in config/app.php.
'providers' => [
	
	Barryvdh\DomPDF\ServiceProvider::class,
],

'aliases' => [
	
	'PDF' => Barryvdh\DomPDF\Facade::class,
],
 3. Now create a new controller and writhe the following command in header of that controller
 use PDF;
Now make a function to generate pdf and enter the following code

 $customer = Part::find($id);
         $pdf = PDF::loadView('customers.partPDF', compact('customer'))->setPaper('a4');
         return $pdf->stream('customerPDF.pdf');
4. Now make a blade file and then wite the following smaple code 


<style>
     td, th {
        border: 1px solid gray;
        padding: 8px;
    }
    table{
        border-collapse: collapse;
        width: 100%;
    }
    .heading {
        text-align: left;
    }
    td, th{
        font-size: 12px;
    }
    th{
        background-color: black;
        color: white;
    }
    .center{
        margin-left: auto;
        margin-right: auto;
    }
    .main-border{
        border: 2px solid gray;
        margin: 10px;
        padding: 20px;
    }

</style>
<div class="main-border">
    <div>
    <img src="assects/images/leaf2.png" width="30px" alt="">
    <span class="heading" style="font-size: 20px">Sardar Rice Mills</span>
    <div style="text-align: center"><b>Sale Invoice</b> [{{$mytime}}]</div>
    </div>
    <div style="text-align: right">Sardar Rice Mills <br>
        Dinga Road, Near Keeranwala <br>
        Tehsiel and District Gujrat <br>
        03001234xxx
    </div>
    <span>To, <br> 
    {{$customer->name}}<br>
    {{$customer->contact}}<br>
    {{$customer->address}}</span>
    <br>
    <br>
    <table class="center">
        <thead>
        <tr>
            <th>Sale Id[Date]</th>
            <th>Description</th>
            <th>Rate(/40kg)(Rs.)</th>
            <th>Quantity(kg)</th>
            <th>Amount(Rs.)</th>
        </tr>
        </thead>
        <tbody>
            <tr>
                <td rowspan="5">{{$sale->id}} [{{$sale->created_at}}]</td>
            <td>{{$sale->product->name }} (Id.{{$sale->product_id}})</td>
            <td>{{number_format($sale->product_rate, 2)}}</td>
            <td>{{number_format($sale->sale_quantity, 2)}}</td>
            <td>{{number_format($sale->sub_total, 2)}}</td>
        </tr>
        <tr>
            <td>Extra (Rs.)</td>
            <td></td>
            <td></td>
            <td>{{number_format($sale->extra, 2)}}</td>
        </tr>
        <tr>
            <td>Discount ({{$sale->discount}}%)</td>
            <td></td>
            <td></td>
            <td>{{number_format((($sale->sub_total*$sale->discount)/100), 2)}}</td>
        </tr>
        <tr>
            <td>Comission ({{$sale->comission}}%)</td>
            <td></td>
            <td></td>
            <td>{{number_format((($sale->sub_total*$sale->comission)/100), 2)}}</td>
        </tr>
        <tr>
            <td>Total (Rs.)</td>
            <td></td>
            <td></td>
            <td>{{number_format($sale->total, 2)}}</td>
        </tr>
        
    </tbody>
    <tfoot>
        <tr>
          <td id="total" colspan="4" style="text-align: right; border:none">Total :</td>
          <td><b>{{number_format($sale->total, 2)}}</b></td>
        </tr>
        <tr>
            <td id="total" colspan="4" style="text-align: right; border:none">Paid Amount :</td>
            <td>{{number_format($sale->paid_amount, 2)}}</td>
          </tr>
          <tr>
            <td id="total" colspan="4" style="text-align: right; border:none">Pending Amount :</td>
            <td>{{number_format($sale->pending_amount, 2)}}</td>
          </tr>
       </tfoot>
</table>
<div style="text-align: center; margin-top: 40px">Thankyou!</div>
</div>