You can use the modal property to set the Speed Dial as modal which adds an overlay to prevent the background interaction.
ej.base.enableRipple(true);
// Initialize action items
var items = [
{ iconCss:'e-icons e-cut'},
{ iconCss:'e-icons e-copy'},
{ iconCss:'e-icons e-paste'}
];
// Initialize the SpeedDial control with modal
var speeddial = new ej.buttons.SpeedDial({
items: items,
openIconCss: 'e-icons e-edit',
target: '#targetElement',
modal: true
});
// Render initialized SpeedDial
speeddial.appendTo('#speeddial');<!DOCTYPE html><html lang="en"><head>
<title>EJ2 SpeedDial</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">
<!-- Add the SpeedDial component styles. -->
<link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
<link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
<link href="styles.css" rel="stylesheet">
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
<div id="container">
<!-- Elements to render the SpeedDial component. -->
<button id="speeddial" title="Edit"></button>
<div id="targetElement" style="position:relative;min-height:350px;border:1px solid;"></div>
</div>
<script>
var ele = document.getElementById('container');
if(ele) {
ele.style.visibility = "visible";
}
</script>
<script src="index.js" type="text/javascript"></script>
</body></html>#container {
visibility: hidden;
}
#loader {
color: #008cff;
height: 40px;
left: 45%;
position: absolute;
top: 45%;
width: 30%;
}