If you want to incorporate margin into your styling, there are a few ways to do it:
One way is using inline CSS:
<label>
<input type="checkbox" style="margin-right:15px;">
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</label>
Another option is internal CSS:
<head>
<style>
input[type=checkbox]{
margin-right: 15px;
}
</style>
</head>
<label>
<input type="checkbox" style="margin-right:15px;">
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</label>
Lastly, you can use external CSS:
Within style.css:
input[type=checkbox]{
margin-right: 15px;
}
And in your page.html file:
<head>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<label>
<input type="checkbox" style="margin-right:15px;">
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</label>
Here are some demos for each method:
Inline CSS Demo
Internal CSS Demo
External CSS Demo