CSS Boutons HTML

@charset "utf-8";
 @import url('https://fonts.googleapis.com/css?family=Cairo&display=swap');
a:link, a:visited {
border-radius : 5px;
color: white;
background-color: #141414;
padding: 20px 0%;
margin : 10px 5px 10px 10px;
width: 30%;
box-sizing: border-box;
text-align: center;
text-decoration: none;
display: inline-block;
font-family: Cairo;
font-size:15px;
font-weight:bold;
}
a:hover, a:active {
background-color: #C72E2E;
color: white;
transition: color 0.2s, background-color 0.2s;
}