.btn-default:active:focus, .btn-default:active:hover {
color: #333;
background-color:lightseagreen;
border-color: #8c8c8c;
}
.btn {
background: #eee;
}
<input class="btn btn-default" type="button" value="Input">
原文：https://www.cnblogs.com/anxiaoyu/p/11137020.html