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Customize icon and width

Width of the DropDownButton can be customized by setting required width to the dropdown element.

The following UI can be achieved by setting iconPosition as Top, width as 85px and size of the font icon as 40px by adding e-custom class.

Source
Preview
app.ts
index.html
styles.css
import { DropDownButton, ItemModel } from '@syncfusion/ej2-splitbuttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

// Initialize action items.
let items: ItemModel[] = [
    {
        text: 'Find'
    },
    {
        text: 'Replace'
    },
    {
        text: 'Go To'
    },
    {
        text: 'Go To Special'
    }];

// To initialize DropDownButton with `e-custom` class.
let drpDownBtn: DropDownButton = new DropDownButton({
    iconCss: 'e-icons e-search',
    cssClass: 'e-custom',
    items: items,
    iconPosition: 'Top'
    }, '#iconbutton'
);
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 DropDownButton</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="styles.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <button id='iconbutton'>Find & Select</button>
    </div>
</body>

</html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.e-search::before {
  content: '\e993';
}

button {
  margin: 25px 5px 20px 20px;
}

.e-dropdown-btn.e-custom {
  width: 85px;
}

.e-dropdown-btn.e-custom .e-search::before {
  font-size: 40px;
}