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代码编辑器：

<!DOCTYPE htm>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.bootcss.com/bootstrap/2.3.2/css/bootstrap.min.css" rel="stylesheet">
<style>body {margin:10px}</style>
<style>
.btn-w3r {
    color:#fff;
    width: 200px;
    height: 200px;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border-radius: 50%;
    background: #cb60b3; /* Old browsers */
    background: -moz-linear-gradient(top,  #cb60b3 0%, #ad1283 50%, #de47ac 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#cb60b3), color-stop(50%,#ad1283), color-stop(100%,#de47ac)); /   *   Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  #cb60b3 0%,#ad1283 50%,#de47ac 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  #cb60b3 0%,#ad1283 50%,#de47ac 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  #cb60b3 0%,#ad1283 50%,#de47ac 100%); /* IE10+ */
    background: linear-gradient(to bottom,  #cb60b3 0%,#ad1283 50%,#de47ac 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#cb60b3', endColorstr='#de47ac',GradientType=0 ); /* IE6-9 */
}
</style>
<div class="container">
    <div class="row">
        <div class="span5">
            <button type="button" class="btn btn-w3r">Default</button>
        </div>
    </div>
</div>

代码编辑器：

运行结果：