JSFiddle - React, Tailwind, and code Playground

HTML

<button>Save</button>

CSS

button::-moz-focus-inner{padding:0;border:0;}

button, .button {    line-height: 29px; border: solid 1px #464747; color: #fff;    position: relative; display: inline-block; margin: 0; padding:0 12px; font-family: Verdana; font-size: 12px; font-weight: bold;
    background: #868687; /* Old browsers */
background: -moz-linear-gradient(top, #868687 0%, #868687 50%, #6d6e6f 51%, #6d6e6f 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#868687), color-stop(50%,#868687), color-stop(51%,#6d6e6f), color-stop(100%,#6d6e6f)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #868687 0%,#868687 50%,#6d6e6f 51%,#6d6e6f 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #868687 0%,#868687 50%,#6d6e6f 51%,#6d6e6f 100%); /* Opera11.10+ */
background: -ms-linear-gradient(top, #868687 0%,#868687 50%,#6d6e6f 51%,#6d6e6f 100%); /* IE10+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#868687', endColorstr='#6d6e6f',GradientType=0 ); /* IE6-9 */
background: linear-gradient(top, #868687 0%,#868687 50%,#6d6e6f 51%,#6d6e6f 100%); /* W3C */
    -webkit-border-radius: 11px;
    -khtml-border-radius: 11px;
    -moz-border-radius: 11px;
    border-radius: 11px;
    
    -webkit-box-shadow: 0 0 5px rgba(0,0,0,1);
    -moz-box-shadow: 0 0 5px rgba(0,0,0,1);
    box-shadow: 0 0 5px rgba(0,0,0,1);
}

button:hover { background: #959697; /* Old browsers */
background: -moz-linear-gradient(top, #959697 0%, #959697 50%, #808182 51%, #808182 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#959697), color-stop(50%,#959697), color-stop(51%,#808182), color-stop(100%,#808182)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #959697 0%,#959697 50%,#808182 51%,#808182 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #959697 0%,#959697 50%,#808182 51%,#808182 100%); /* Opera11.10+ */
background: -ms-linear-gradient(top,...

JavaScript

$('button').each(function() {
    $(this).attr('data-content', $(this).val() || $(this).text())
});