JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="button">ссылка</a>
<div class="button">див</div>
<button class="button">кнопка</button>

CSS

.button {
    cursor:pointer;
    padding:8px;
    line-height:2.5em;
    background:#775849;
    font-family:Arial, sans-serif;
    font-size:16px;
    text-decoration: none;
    color:#fff;
    border: outset 2px #73C8F0;
    border-radius: 3px;
    -moz-box-shadow: 0 0 5px rgba(0,0,0,0.5);
    -webkit-box-shadow: 0 0 5px rgba(0,0,0,0.5); 
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.button:hover {
    background:#81a8cb; 
}

.button:active {
    background:black; 
}