Add this CSS
.icheck-primary[class*="icheck-"] > label {
padding-left: 22px !important;
line-height: 18px;
}
.icheck-primary[class*="icheck-"] > input:first-child + input[type="hidden"] + label::before, .icheck-primary[class*="icheck-"] > input:first-child + label::before {
width: 18px;
height: 18px;
border-radius: 5px;
margin-left: -22px;
}
.icheck-primary[class*="icheck-"] > input:first-child:checked + input[type="hidden"] + label::after,
.icheck-primary[class*="icheck-"] > input:first-child:checked + label::after {
top: 0px;
width: 4px;
height: 8px;
left: 0px;
}
.icheck-primary[class*="icheck-"] > label{
padding-left:22px !important;
line-height: 18px;
}
.icheck-primary[class*="icheck-"] > input:first-child + input[type="hidden"] + label::before, .icheck-primary[class*="icheck-"] > input:first-child + label::before{
width:18px;
height:18px;
border-radius:5px;
margin-left:-22px;
}
.icheck-primary[class*="icheck-"] > input:first-child:checked + input[type="hidden"] + label::after,
.icheck-primary[class*="icheck-"] > input:first-child:checked + label::after{
top:0px;
width: 4px;
height: 8px;
left:0px;
}
<html>
<head>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<link href="https://cdn.rawgit.com/bantikyan/icheck-bootstrap/master/icheck-bootstrap.min.css" rel="stylesheet">
<style>
.c-radius{
border-radius:5px;
}
</style>
</head>
<body>
<div class="checkbox icheck-primary">
<input type="checkbox" checked id="primary" class="c-radius"/>
<label for="primary">Keep username same as email id</label>
</div>
</body>
</html>
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